TileMill exports too big mbtile file

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I'am trying to export mbtile file from TileMill to use it in my map server. But file is too huge, 17th level will cost 100+GB only for my country. However, i found free mbtile from openmaptiles.org with only 1GB size for the same are. My question is: How openmaptiles.org reduced 100GB mbtile to 1GB? I don't want to use 1gb file because they have watermarks all over the map

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Yernar Arystanov On

I found out that openmaptiles.org provides only 14 zoom levels and can be over zoomed till 18. Overall, 14 layers are >1gb size