Earlier quoted context omitted.
I am very suspicious of Signal, for not not being on f-droid, but being on play store. I'm sure the protocol is fine and all, but playstore can easily be used to compromise everything anyway. Also I've read many times Bruce Schneier claim that Signal is the most secure communication system that exists, and Whatsapp is the 2nd best, because it (allegedly, but we don't know) uses the same protocol.
Do you think F-Droid is more resilient to malicious influence than Google's Play Store? I haven't looked deeply into how F-Droid is currently operating, so maybe I'm off here, but isn't it just all on a server run by some random guy in his free time? I love what F-Droid is doing, and I think it has a bright future, but in its current state I would never trust it on any of my devices that I use for anything important.…
I think that google and apple would just comply and do whatever they are told, while the f-droid guy needs to be hacked and might notice he got hacked, so in that sense it's safer.