This one happened just a month ago so it might be what the parent comment is referring to. Basically, somebody made a fake company to make bogus copyright claims against someone to hurt their channel. Youtube refuses to deliver counterclaims unless the YTer puts their government name on it (he originally tried to deliver it via an attorney).
Additionally, the other party is actively trying to compromise the YTer's other accounts and identity to damage him, so any new data point given to this person represents risk.
I don't really care for this YTer (they made a video essay about someone who doesn't really want to be in the media circus anymore, could just MYOB) but the methods documented in this video can be used to doxx any user that uploads a video. All you gotta do is convince youtube that you own some piece of common non-royalty media that a youtuber uses to gain leverage on them. A lot of this kind of media is old with unfindable owners, so even if YT does want to spend the time to validate, there's nowhere to go with it.