So even if it were open source, that wouldn’t be a reason for you to trust it?

Just curious: what would have to change for you to even consider it? Is it more about the concept itself, or the way it's implemented?

Literally nothing would change my mind: I do not care to have anything that sees and hears everything I do. It's not a problem I will ever have, and the issues and vulnerabilities of such a thing are too many to even consider.

Build a POC for yourself and use it. Go from there.