…that proved that the algorithms/protocols work.

You can use a perfect algorithm and still be insecure because the implementation was bad. You are trusting the SimpleX Chat devs to a degree.

I wouldn’t trust encryption made by anti-vaxer more than…

Important to note: SimpleX Chat has gone through two security audits.

The SimpleX Chat is AGPL. If the founder is problematic, one can fork it and avoid reinventing what has already been made.

It is forkable if necessary. I do think SimpleX is a great piece of software that shouldn’t be reinvented because of the founder.