The permissions required to run Signal scream honeypot. It's not a privacy app. Plus, the founder is basically anti-bitcoin.

Proton : it's just one step away from temporary mails for me. I use it when temp mails don't work. For anything private, I don't use email. Ever since they decided to collaborate with a mossad-connected security company (for that DDoS they had some years back), I've been suspicious about them.

For most things private, Simplex seems better at this point.