Unlike Whatsapp, Signal doesn't store your network of contacts. They have your phone number, time of registration, and time of last connect to their servers. They go to great lengths to keep the rest private. In Signal's case, I don't see an issue at all, but I do see all the benefit.
the second step is realizing it isn't going to change, at least not any time soon
No, I will never have this attitude. I refuse to believe that we couldn't at any moment choose to change our course. The rich and powerful fear it. Believing things won't change, sooner or later, only benefits them and not us. There is no magical right time for change, there's only now.
Knowing Google, they care more about blurring the lines between AI and reality to confuse and force it onto people than they do about saving a few dollars on storage costs.
Whoever creates this stuff has no idea what pain is whatsoever. I am utterly disgusted. If you really want to make creepy stuff, you can go ahead and do it. I would never wish to incorporate this technology into my work at all. I strongly feel that this is an insult to life itself.
Personally, the open source community's aversion to algorithms is what's holding me back. Say what you will about them, but I've found many great songs thanks to Spotify's algo.