whaa
If I setup a board/position and screenshot it

Like if I create a setup on board can i screenshot it and post it somewhere?
bruh

Is it copyrighted by chess.com?
or can i post it somewhere
chess.com staff or a lawyer could better answer this than me but chess positions can't be "copyrighted" lol
chess.com may have legal claims to software or something, but I'm sure it is fine to post a screenshot of a chess position on chess.com - cite it as on chess.com if super worried, but you can't copyright chess positions or ideas
That is one reason openings go in and out of style and variations are sometimes renamed.
Is it copyrighted by chess.com?
or can i post it somewhere