FWiW Greg Egan has had a good run - 40 years online, 10+ novels, many short stories, Hugo and Campbell awards (and others) . . . and yet: No verified images nor any evidence that is indeed his real name.
Gwern Branwen is a prolific [1] netizen who is also completely anonymous. I don't know how people like him [2] do it. Surely the people who know him IRL are aware of what he's working on day-to-day and someone would be able to connect the dots. Unless he lives alone or his housemates are completely offline - and he doesn't talk to anyone IRL about what he does at home.
[1] Sometimes on Twitter or Hacker News I legitimately just scan my eyes around the screen expecting a comment from or link to Gwern to be already in my field of vision.
[2] I have seen since-scrubbed evidence Gwern is a "him" though he now seems to hide that too