He is the owner though.

If zuck wanted, he could solve it. Decimate middle management, downsize at a level of what musk did to Twitter and then _slowly rebuilt_ in order to pay attention to the culture this time, removing anyone that takes part in such behavior...

The company would be worth more (because smaller headcount) and likely even ship more, because the culture would be better.. I've never worked at Facebook though, I'm just an armchair analyst being judgemental from reading some comments.