SubStack really pushed the limits of how fast a platform can speedrun the full enshittification process. From idealistic founding to promoting unsubtle neo-nazis to vanilla app users, in only 8 years. I'm pretty sure that's a record. It took Titter almost 20 years to slide down that same curve.
https://www.webworm.co/moresubstackthoughts/
EDIT: Forgot the link that backs up the promoting unsubtle neo-nazis claim.