There’s a 90% chance the other end of your conversation will be with someone on Matrix dot org or a server they host for a organization. Like email, your other end is likely still using Google or Microsoft so the metadata & anything else unencrypted is going to be synced back to the centralized server.
My partner has slowly been walking away from everything like that too. The hard part is she has done a lot in marketing & now wonders if it is all bullshit/evil, but it is still needed even for the good products & services, just not in deceptive or manipulative manner.