I also tested Firebase but quickly ran into issues.
Firebase's database is a NoSQL database, whereas almost all my data for the apps and (micro-)SaaS I was building had relational data.
Their frontend data fetching felt clunky and did not fit my requirement.
Also, the fact that Firebase is a closed-source backend felt scary in the hands of Google (https://killedbygoogle.com/).
Firebase's problems and my desire to have the perfect backend made me build an open-source alternative to fix all the shortcomings. PostgreSQL instead of NoSQL. GraphQL instead of REST. 100% open source. That is now https://nhost.io.
Thanks for sharing. On first impressions, I found Nhost's product to be really cool, so much so that I actually applied for the open position of Product Designer [Tahmid].
And since it hasn't taken off (and probably won't ever), it just costs me a pennies a month since I'm under their free limits, plus the domain.