Earlier quoted context omitted.
Supabase is also Postgres-based. https://supabase.com/docs/guides/database/overview
I understand that. But bit.io gave you a postgres database. Supabase gives you a firebase alternative that just happens to be built on top of postgres. - https://supabase.com/docs/guides/getting-started/features - https://docs.bit.io/docs/getting-started
Supabase gives you a full Postgres database, we position ourselves as a Firebase alternative because we offer a few other bells-and-whistles. The database is just postgres[0] and so it has more compatibility than bit.io offered[1]
[0] https://github.com/supabase/postgres
[1] bit.io compatability: https://docs.bit.io/docs/supported-sql