The witches.town shutdown is a micro-lesson in why SaaS is problematic and why the Federation model of "idealistic admins run code for community" is no improvement.
If you depend on other people for your computing, let alone for your identity online and social life - you will get screwed WHEN (not if) their needs and yours diverge.
Accounts closed, instances shut down, software upgrades with unwanted "features", privacy concerns: all inevitable.
Sorry... ๐