Awesome! Congrats for shipping!
90% of the projects I work on are built on Firebase, our main worry with that is that we are locked-in, not only to "Firebase", but to Google as well which has a nasty history of just pulling the rug from under your feet without even telling you why.
Having alternatives to try and implement is always a priority for us and Supabase now (w/ edge functions) seems to cover most of our use cases, so we are definitely looking to switch to it.