The logic that Epic and Unreal Engine will do something similar as Unity doesn't track for me. The argument hinges on the premise that Epic, who operates their own game store and is courting developers aggressively with generous revenue split, is willing to burn their bridge with developers for questionable increase in profit; in addition it presumes that the plain old revenue share model that Unreal Engine utiltizes…
One of the "analysis" threads by a VC on Twitter mentioned the engine not making as much money as the ad business as "unsustainable". But it's the same nonsense Musk spouted with Twitter not being sustainable or "making a profit" -- it made a profit but not given the market realities deliberately hoisted upon it.