What do you mean “dying”? Facebook and Instagram are absolutely the dominant social networks / apps in most of the world. Sure there are insane amounts of bots, trolls, scammers and manipulators, but that doesn’t make a platform “dying” while billions of people still use it.

I can see this app you mentioned on mobilism.org. You need an account to get to the forum though, and I don’t know if they’re open to signups.