You can also install Signal and keep behemoth app
it doesn’t have to be all or nothing in one sudden quantum leap
install the alternative and use it with those who are using it
When you are comfortable, start using the alternative app exclusively or, conversely, if uncomfortable, uninstall it and continue using behemoth app
I don’t understand this dramatic ultimatum position people are imposing on themselves where they feel they cannot abandon loyalty to an app (be it made by a behemoth or otherwise)
Most people do not even know the existence of the choices they have. You are right that one of the choices is to use all, which is fine by me. To each its' own. Loyalty is a big word when it is rammed down your throat as "this is the only thing everybody uses", but I get your point. :-) By deleting my Facebook-page, I tripled the amount of visitors to my site, which could be coincidence (which it is not), because people seem to see the idea behind that move: an algorithm didn't decide for them whether they see my work or not.
I do not like half-baked versions of privacy, like saying Whatsapp is encrypted, while it still runs through Facebook-servers, while Facebook still seem to use all data for their own commercial goods. Encrypted maybe, but still used as tool for commercial purposes which are forced onto people.
Loyalty like that comes with a price and I do not like to be part of that, which is a choice I am most liberate to take. Looking at my communications with potential clients, the real visitors to my site and the people that seem to see that choice as what it is: using freedom. My family, friends and clients are just as free to do with that choice what they want. Personally, I prefer that above hypocrisy and half-baked choices, but still see their choice as good, whatever it is, because it is theirs. :-)