There's an element of "how can they be so inefficient" in this thread, but hardware has come a long way in the last 12 years. I'd bet you could handle this scal

There's an element of "how can they be so inefficient" in this thread, but hardware has come a long way in the last 12 years. I'd bet you could handle this scale with a single DB and 3-4 read replicas with modern hardware for example.