What kind of data? Databases showing millions of master games are available. You want all the billions of games of random players? Why?
Why does chess com not have open data?
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I don't think it's necessary
Idk
#2 a players database is unbelievably useful when preparing openings
I mean players can also go through the games to search similar games to ones they usually play and learn from it I guess, that's possibly one reason.
Why does chess com not give rated games data like lichess?