It isn't a fork, it's an entirely new database that implements the same API. c.f. https://twitter.com/nathankpeck/status/1083385031207387136 https://twitter.co

It isn't a fork, it's an entirely new database that implements the same API. c.f. https://twitter.com/nathankpeck/status/1083385031207387136 https://twitter.com/nathankpeck/status/1083385031207387136 from someone at AWS DevRel. There's nothing about Mongo's license that's super relevant here -- it's a similar situation to other cloud providers offering "S3"- or "EC2"-compatible APIs. (IANAL, but AIUI API copyright/fair-use isn't entirely settled in the US, Oracle v. Google nonwithstanding, since 9th Cir. isn't per se controlling precedent nationwide in copyright matters)