What was Musk's biggest bugbear about 'old' Twitter? The moderation system. If Twitter goes under, the only practical alternative at the moment is Mastodon, and Mastodon can't replicate Twitter's moderation due to its architecture. So Musk gets what he wants anyway. He doesn't have much to lose in this scenario: Financially, he'd remain a very rich person. One can argue he'd be better off without Twitter anyway.