> The one and only thing that you cannot do is offer a commercial version of CockroachDB as a service without buying a license.

This is dishonest and deceptive. One other thing you cannot do is use their code and incorporate it in your open source project.

They used to provide an open source parser for postgres' sql syntax. Now it is closed source for 3 years.

I don't mind the license change. Lying however is not a good way to behave with customers or open source communities.