All of my domains are .eu and are hosted in Europe and are under European GDPR rights.

One reason to use Matrix on your own server.

As if I’m supposed to take them at their word?

Not bloody likely.

I use Pass since a few years. It has a wonderful package for Emacs, and great iOS apps with face ID for ease of use, and the DB can sync to your own private git server behind tailscale. If you have a server, I definitely suggest looking into it. You can check it out at https://www.passwordstore.org/