I think the reason some GMs might want to remain anonymous is not to reveal their preparations. I'd suspect that the absolutely top players consider Lichess Titled Arena to be sort of a "playground" to perhaps try some new ideas, check if they'd enjoy playing a particular opening etc. Obviously, they'll not reveal the deepest secrets of their preparation for some upcoming prestigious real life tournament anyway, but just the fact they play something slightly different than they usually do could be a valuable information for their opponents.
So I'd let them remain anonymous, if that's what they wish to do. Forcing them to reveal their identity could put some people off and we wouldn't get to see some very interesting matches. The pressure would be much higher, they wouldn't want to "embarrass themselves" trying some crazy ideas etc.
So I'd let them remain anonymous, if that's what they wish to do. Forcing them to reveal their identity could put some people off and we wouldn't get to see some very interesting matches. The pressure would be much higher, they wouldn't want to "embarrass themselves" trying some crazy ideas etc.