as a heads up, this doesn't work on desktop and you'll need to do it on the mobile youtube app right now. no idea if that'll change later but better safe than sorry. I know I'm not the only one who this would probably expose to people that don't need to know I'm trans
Security alert: YouTube added a feature that now puts your username in shared links, so if you share a YouTube link on here, everyone who clicks it will know your YouTube username.
To turn it off, go to Settings - Privacy and turn off "Channel visibility for shared links"