The big thing is that it is invite only. Also, I find it easier to use than mastodon.
Another point, I need more shitpost in my feed. I fucked up with my mastodon feed and have too much political crap on there. I ended up saving a good amount of invites and invite only to small group people I like and want to keep touch with (no rando). So, I ended up with a small cohort of people over there that I can share thoughts and photos with.