I’m not sure I see how the state of Minecraft PS4 is Microsoft’s fault either. By that logic shouldn’t Xbox 360 and PS3 owners be screaming too? They get no further updates and can still buy DLC.
As I recall PS3, PS4, and Vita can all cross-play, although they are limited to smaller worlds. Sony’s walled garden is intact - as they want it.
Remember Microsoft / Mojang could have pulled the game from PSN entirely. Given its popularity that would have been a dick move but arguably good business sense.
What irritates me is Sony’s claim they support cross platform play but how their conditions make it impractical for anyone to actually do - including Epic with Fortnite.