I have had many friends rage quit .. life.
So the idea of rage quitting an online forum, is inconsequential compared to that.

I know a few high end forums that have daily rage quits from 10-20 year vets. Dying forums.
Politics is what is killing those forums. but anything can lead to it.
This is why I say it is risk mgmt.

When I said "**** it" to Manga Raiders after a 13 yo was allowed to retcon (the biggest crime against writing) a communal piece, I didn't delete all my stuff. I left it so some could learn from it (they didn't). I'm not like most people though.

Knowledge is critical. maintaining a record of what happened is part of that. Letting people delete parts of that record is unforgivable.