Regarding the new rule against abuse content, I suspect they're either trying to boost their wholesome image to advertisers, or it's in response to complaints about specific things on the site. I don't think they'd prohibit content unless someone is posting it, horrible as that sounds.
To put it in your terms: they're trying to drive away some creeps that might scare advertisers.
Regarding allowing AI porn... since advertisers don't like porn, these new policies should cancel each other out, lol. I suspect neither of these changes is directly related to any of the recent drama.
I think that's a good sign. It probably means the problem is being dealt with by admins. Any communities on the affected instances that have subscribers on other instances will be backed up on those other instances, so most of the content is safe no matter what. I just hope the users on those instances know they can come to others in the meantime.