Playing with 900 rating players on
Chess.com feels same with playing with 1500 rating players on Lichess. Why is it so?
Bullet, blitz or rapid rating? On Lichess, players have higher rating and you can't make a comparison based on the numbers alone, however the difference is probably 300 rating points maximum, not more.
Maybe you're talking about 2-3 players only or is this how you feel all the time? Maybe those 900 rated players you're talking about, simply cheat on another website. Who knows.
Lichess seeds new players at 1500.
And
chess.com 1200 so you could say 900 @chess.com `1200 lichess