@andreagrandi You got some answers already, but here is a writeup from one of the devs if you want their perspective https://github.com/superseriousbusiness/gotosocial/issues/3723#issuecomment-2630492256
tl;dr crawlers were ignoring GtS robots.txt files, the devs added a way to randomise stats, some crawlers retaliated by removing all GtS servers from their database