James and team has done an absolutely amazing job with Firebase, very much a pioneer and industry leader. It makes me sad that Google then price gauges it.
I believe James is working on a solution/work-around for everybody, I chat with him occasionally and trust him, so I still encourage people to keep using Firebase. And that is coming from me (I work on gun, an OSS alternative with graphs that you can self host - https://github.com/amark/gun), so while I have an incentive to get people to use gun, I have to keep plugging Firebase because they are amazing (I don't say this about everyone, as I have said pretty harsh words about other database systems. But there are some that deserve legitimate respect, like Firebase, RethinkDB, and others).