An idea so old is new again. The Internet and it's early services (Usenet, email, IRC, etc.) we're all designed from the start to be decentralized. After 20+ years of people consolidating into centrally-controlled mega platforms, I'm happy to see things coming full circle.

Agreed, platforms should compete by providing better UX and features, not by abusing network effects and walling off themselves to hold communities and accounts hostage. In a way the fediverse provides a common carrier that is neutral to the users and platforms connected to it, which enables competition in the same way that guaranteeing equal access to physical internet infrastructure to new ISPs is essential to preventing ISP monopolies.