I am aware. Community management is different from what is legally possible. Were a project owner start to act in a self-interested or malicious manner, then I think proudly and aggressively forking a project is a great idea. That's not Redis. Like I said, it may be a good idea to have a multi-threaded Redis, but Redis users tend to love Redis. I would probably lean into that goodwill instead of against it.
I don't see forking as being aggressive. It's the natural thing to do if you want to take the project in a different direction to its stewards. Often lessons are learned from that process and the learnings integrated back into the main project.
"If they won’t then we will." sounds harsh imho.