Chess is a difficult game, and their are many factors involved, psychology, calculating, creativity and many more,
Health is amongst those factors, and losing a game online, can spark a number of negative thoughts such as: where did I go wrong etc...
I have developed inner hatred for online chess, because of all the time I wasted watching tutorial videos, countless hours of trying to beat Stockfish level 7 on another chess site, and all the books i read.
The best games of chess are played in a live club, but the pandemic has stopped real club meetups, which is annoying, so theres no other alternative than Online Chess.
Its not at all dangerous to play chess online, But it's really dangerous to see Forums.
https://chesskid.com
Are you for real.