2006 - 2022: Corporate content hosts are so cheap and easy that no one has an incentive to learn to self-host content, and people who were previously self-hosting content move over to big "social" platforms
2022 - … : Platforms close off in every imaginable way and start taking every opportunity to extract rents from users, benefits that originally got people to move over now gone, but the network effects are such you can no longer switch to open alternatives or convince other people to do so