The next one to enshittify will be Threads. Right now it's in the honeymoon stage where there aren't any ads so people are encouraged to use it and help grow the platform.
I used Threads for the first day. And seeing occasionally promo pics that James Gunn posts of Superman. But from my ancedotal experience, Threads is already full of bots, escort services, and random tweeters who I have no interesting in following. I feel Threads might be shut down eventually or integrated into Instagram perhaps.