Briar isn't on iOS. I'm not an Apple user myself, but this is a major sticking point. A large percentage of mobile users are on Apple (especially younger people), and if you're not there, you won't reach the masses.

I didn't realize. Yeah, that's a good point.

+ Briar is permissoned. You have to exchange QR code

If someone really wants it it could possibly be vibe-ported to iOS. @calle did the same for Bitchat the other way round. (I'm not an expert though)