There are between 10 and 20 people actively working on the app in various capacities, there was an update on team structure couple of days ago - https://lemmy.ml/post/1372165
It is the original dev who is stepping down and who says he wasn’t actively involved with development for a while.
I think I tried to get into that one, but the Test flight was full. There are plenty out there (I’m typing this with wefwef), but I think Liftoff is still my favorite.