Check your facts. Matrix remains an open protocol, under open source license, with open governance, stewarded by a nonprofit. And there remain multiple open source server implementations and clients.

As useful as Cory Doctorow's concept of enshittification is, it has absolutely no utility in describing what is happening here.

Nobody is being locked in, the user experience is incrementally improving as the spec and the implementations evolve, and we're sure as hell not collecting ever more data and using recommendation algorithms to shove advertising down people's throats.

There are plenty of valid critiques. But what you're saying here is just patently absurd.