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It is niche. I use it. Keeps improving. A little light on features but unlike Telegram not going to screw people.

The thing about these messenger apps is that it is usually determined by the circle of friends, colleagues & etc which one to use. So I rarely try out new ones

Yep. Well if people are concerned about having their stuff saved and getting hacked, then use the regular ones. Those who want privacy are moving to signal.

Well, I use those mainly for sending grocery story lists, memes, and occasionally dick pics to ex-GFs so nothing controversial.