What are the chances of an official C# library being in the works? I think this would greatly fill the needs for unity devs. I use firebase on almost all game backends because of how quickly I can get set up with auth and a db.
I used supabase in my latest project and it served my needs but there were a few difficulties to overcome. The greatest shortcoming was the lack of real time support (C#), and I had to do everything via REST api.
I am planning on publishing the game as OSS and making some learning videos about it