ok
am i allowed to talk about lichess in chess.com forums?

Usually no. It has become sort of a joke that people don't write out other site names fully (something like l*chess) just to be on the safe side. chess.com makes it clear that the public forums are not for advertising competing chess sites. If one must mention another chess site by name, then it might be okay, but usually people saying sites by name like to brag about the amazing features other sites have. Why do this here? That is like walking into a luxury restaurant and only talking about how great fast food restaurants are.

lichess is better than chess.com
Not for variants
no, chess.com variants suck compared to lichess

You sure about that @1cbb or is it just that you are only looking in live chess and not realizing that chess.com has a bunch of variants:
https://www.chess.com/variants
am i?