Everyone I know uses WA, but a significant amount (~50%) uses Signal as well, most of those are not tech people. Back when they announced the crypto stuff, I knew next to no one with it, so that doesn’t really matter. I think only 1 or 2 people still use Threema in addition to the other apps.

Telegram I only know 2 users, one who’s American, and one who’s into conspiracies …