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