> Would you mind expanding on your thinking, please?

They touched MUI4... it is proven.
The qurstion is: Did they have right to do that or not? Usually they have because their leader is lawywer and immediatelly comes the reason why they could, and it isn't against the law.
But, if anybody closing their source, they start to attack... Or before anybody want to touch it (just see the case of TimberWolf).

But, there were more serious stealings also in the OS4's history, as I heard.