It's the only sustainable way to have business model around open work.

With pure open source licensing you have asymmetry - where a) you guys implement it b) we sell it, thanks - problem. You cannot run sustainable business around it.

As far as I understand it they want to preserve "open sourceness" for self hosted projects - ie. if you run redis in your docker/vm/k8s, you're fine. But if mega corp clouds are offering managed service, they need to give back a cut from premium they're charging end users.