Yes, that's one of the alternate site domains.
pleasedontblockchess.com is it from chess.com?
Yeah, this was something that chess.com did during the chess boom of 2020 when schools started blocking chess.com because people would spend too much time on it. So they created tons of alternate domains so that people could play it again at school and on school devices. Or at least that's what I remember, not sure if I got that all right.
I was visiting my webmaster tools for my site: https://chessjunction.com
and I found that this website is linking to my site, when I opened link its look like same chess.com, is this domain also bought by chess.com? anyone who clarify? Here is a screenshot