Would anyone still use a desktop-only (no mobile) messenger where you have to run/turn on intentionally (not always-on like most mobile-first messengers nowadays), lists online/offline friends the way AIM/ICQ did, and you can only send messages with online friends?

I get that most leisure computing has moved off of desktop to mobile in modern days, but there's definitely enough of us nerds who're on a computer a lot (even if just for work, if nothing else). It can't be any less than in the late 1990s when ICQ was popular.