Amberly Rothfeld wrote this very good summary of what's going on and it's not paywalled.

In short, it seems like they're cracking down on certain TOS violations and spammy behavior. It's affecting Youtubers and Streamers outside the adult industry as well so it's not even entirely directed at us.

Keeping your PFP/header PG is important, so is flagging yourself as sensitive content. Twitter haaaaates autotweets (this is why YouTubers and streamers are getting banned) so it's a good idea to remove previous autotweets in addition to disabling them.

Twitter also considers "backup accounts" a form of ban evasion and will ban people who openly advertise them. It's not against the rules to have multiple accounts especially if they're for different purposes, but if you call it a "backup account" or treat it like one you're much likelier to get booted.