Parsing the Google GDRP Consent string in Swift/IOS

Question

I have been trying to prepare for the upcoming AdMob mandate to support EU GDPR regulations in January 2024. As it turns out, if the User opts not to consent or uses "Manage Options" but doesn't toggle the correct combinations of options, no ads will be filled by AdMob.

I was able to find an Android solution to parsing the UMP Consent String in order to determine if my AdMob ads would be supported based on the User's responses to the consent form. That code is here:

https://itnext.io/android-admob-consent-with-ump-personalized-or-non-personalized-ads-in-eea-3592e192ec90

I was able to convert those helper methods to Swift for IOS and want to share that code here:

    //MARK: GDPR: Parsing Google UMP Consent String
    
    // https://support.google.com/admanager/answer/9681920?hl=en
    // https://itnext.io/android-admob-consent-with-ump-personalized-or-non-personalized-ads-in-eea-3592e192ec90

    func fetchUserDefault(forKey: String) -> String
    {
        let prefs = UserDefaults.standard

        if let value = prefs.string(forKey: forKey)
        {
            return value
        }
        else
        {
            return "";
        }
    }
    
    func canShowAds() -> Bool
    {
        let purposeConsent = self.fetchUserDefault(forKey: "IABTCF_PurposeConsents");
        let vendorConsent = self.fetchUserDefault(forKey: "IABTCF_VendorConsents");
        let vendorLI = self.fetchUserDefault(forKey: "IABTCF_VendorLegitimateInterests");
        let purposeLI = self.fetchUserDefault(forKey: "IABTCF_PurposeLegitimateInterests");

        /*
            The end user grants Google consent to:
         
                Store and/or access information on a device (Purpose 1)
         
            Legitimate interest (or consent, where a publisher configures their CMP to request it) is established for Google to:
         
                Select basic ads (Purpose 2)
                Measure ad performance (Purpose 7)
                Apply market research to generate audience insights (Purpose 9)
                Develop and improve products (Purpose 10)
         
                For Personalized Ads:
         
                Create a Personalized Ad Profile (Purpose 3)
                Select Personal Ads (Purpose 4)
         
            MUST provide consent to Google Advertising Products in Vendor Preferences List (not alphabetized) in order to get ads from AdMob
                
        */

        let googleId = 755;
        let hasGoogleVendorConsent = self.hasAttribute(vendorConsent, googleId);
        let hasGoogleVendorLI = self.hasAttribute(vendorLI, googleId);

        var indexes = [Int]();
        indexes.Add(1);

        var indexesLI = [Int]();
        indexesLI.Add(2);
        indexesLI.Add(7);
        indexesLI.Add(9);
        indexesLI.Add(10);

        return self.hasConsentFor(indexes, purposeConsent, hasGoogleVendorConsent)
        && self.hasConsentOrLegitimateInterestFor(indexesLI, purposeConsent, purposeLI, hasGoogleVendorConsent, hasGoogleVendorLI);
    }

    func canShowPersonalizedAds() -> Bool
    {
        let purposeConsent = self.fetchUserDefault(forKey: "IABTCF_PurposeConsents");
        let vendorConsent = self.fetchUserDefault(forKey: "IABTCF_VendorConsents");
        let vendorLI = self.fetchUserDefault(forKey: "IABTCF_VendorLegitimateInterests");
        let purposeLI = self.fetchUserDefault(forKey: "IABTCF_PurposeLegitimateInterests");

        let googleId = 755;
        let hasGoogleVendorConsent = self.hasAttribute(vendorConsent, googleId);
        let hasGoogleVendorLI = self.hasAttribute(vendorLI, googleId);

        var indexes = [Int]();
        indexes.Add(1);
        indexes.Add(3);
        indexes.Add(4);

        var indexesLI = [Int]();
        indexesLI.Add(2);
        indexesLI.Add(7);
        indexesLI.Add(9);
        indexesLI.Add(10);

        return self.hasConsentFor(indexes, purposeConsent, hasGoogleVendorConsent)
        && self.hasConsentOrLegitimateInterestFor(indexesLI, purposeConsent, purposeLI, hasGoogleVendorConsent, hasGoogleVendorLI);
    }

    private func hasConsentFor(_ indexes: [Int], _ purposeConsent: String, _ hasVendorConsent: Bool) -> Bool
    {
        for p in indexes
        {
            if (!self.hasAttribute(purposeConsent, p))
            {
                return false;
            }
        }
        
        return hasVendorConsent;
    }

    private func hasAttribute(_ input: String, _ index: Int) -> Bool
    {
        let characters = input.toCharacterArray() ///extension method: uses "return Array(self)"
        if (characters.count < index-1)
        {
            return false
        }
        
        let indexValue = characters[index-1]
        
        return (indexValue == "1")
    }

    private func hasConsentOrLegitimateInterestFor(_ indexes: [Int], _ purposeConsent: String, _ purposeLI: String, _ hasVendorConsent: Bool, _ hasVendorLI: Bool) -> Bool
    {
        for p in indexes
        {
            let purposeAndVendorLI = self.hasAttribute(purposeLI, p) && hasVendorLI;
            let purposeConsentAndVendorConsent = self.hasAttribute(purposeConsent, p) && hasVendorConsent;
            
            let isOk = purposeAndVendorLI || purposeConsentAndVendorConsent;
            
            if (!isOk)
            {
                return false;
            }
        }
        return true;
    }

Now that I am able to parse the results of the consent string to determine if my app will be able to deliver AdMob ads, I could use some help guidance on whether anyone knows if it violates any store policie (App Store or Google Play) to prevent Users from using my app should their configuration effectively disable my ads?