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But then Amazon can just release a cheaper replacement called InfestationDB.

I think in such case AWS would be implementing Spanner/F1 directly using Postgres protocol and I'm sure that like Google Spanner itself, it won't be cheap.

For the rest of us we can start using CockroachDB from day zero hoping to get big enough to someday need Enterprise features.

cockroach has a much more thought out model. See: https://www.cockroachlabs.com/pricing/

And the story is already clear and thought out in the license file and Makefile: https://github.com/cockroachdb/cockroach/blob/master/LICENSE

I have used CockroachDB and it a gem. Seamless replication, failover and ultra easy to setup. A bit more polish on certain aspects of it (especially querying) but overall it's excellent. I really hope that they keep their licence structure as-is.

Reading your links, it's comforting that they've thought a lot about their licences and have differing (liberal) licences for various parts of their database.

Well said!