Ugh, what a ball of mud. Well, I think there are two problems here: first, that Reddit has a bug in its anti-abuse software, and second the mob decided to abuse Reddit for hiring this woman who's history is, at worst, questionable.
This is "cancel culture" in a very dangerous form, one that if taken to its conclusion, could prevent someone from ever being employed again. That is a very harsh punishment, handed out without a trial or defense, it is NOT justice.
Furthermore, it puts a potentially chilling effect on employers, and harm employees. The first reaction of employers will be to keep their employee identities entirely secret, and to enforce that secrecy in the work contract. This will harm workers who want to move to a different job, and talk about the work they did.
My firm hope is that this protest is more an emphatic bug report than a mob looking to murder someone's career after spending about 30 seconds thinking about it from all sides.