If you’re a drug dealer and the FBI sends you a subpoena—you could simply….not respond.

I mean sure, but then you’d have bigger problems.

There is actually a bunch of metadata tied to your account and your room.

I understand Metadata is a big problem with Matrix (even for me, personally). Metadata is not personal information if it remains detached from your identity.

If you are someone who ostensibly cares about privacy and security (like a drug dealer)

LOL

why would you rely on the benevolence and security hygiene of a stranger you can’t audit?

I’ve already explained why.

Instead of using a known good actor, like Signal or SimpleX, or no actor, like Briar.

Like I said, there are pros and cons of each. I’m not telling you you should use anything specific. You just have to use whatever works for your situation.