> They should have thought about that

They have thought about it! That's why they are using the BSL.

I note that they are using a time-delayed open source approach (after 3 years it becomes open source) which I understand Stallman has endorsed in the past.

They're using the BSL now. If they cared about revenue protection, they shouldn't have opened it in the first place.

Starting an open source project, taking contributions from the community and getting popularity and traction because you're open source, and then closing it again because you're so popular Amazon might "steal" your revenue? That's just abusing the community.

I can see where you’re coming from, but the work of the community is still (and forever) under the license that was in place when they contributed.

Someone could fork CoackroachDB and continue working on the open source license.