I have had so many issues with Firebase, but the one that really pisses me off the most is that they used to advertise things like "scale worldwide to millions of users" and "Unlimited Connections" but then cap you at 100k concurrent users (10k initially and will gradually bump you up to 100k). When we got in contact with them about this they were nice enough to explain that we could create another database and shard…
I'm curious, what DB tool will you now consider using instead?
I can roll my own using Rails but I'm trying to avoid that.