Isn't this just... 3rd party exclusives then ? I has always existed, you think Dead or Alive 3, Sega GT, Jet Set Radio Future couldn't be ported to PS2 ? Or NGC ? What prevented those developpers to do so ? Probably a signed agreement... Both parties accepted those deals.
Why everyone is so surprised about those things ?
And stop with those "but MS is paying to bring games to more people while Sony is paying to bring games to less people", that's so dumb... If so, why are they making Starfield exclusive ? The game was announced before the potential acquisition of ABK by MS, and what about Elder Scroll VI that has been announced as exclusive too ? PlayStation gamers too loved Oblivion and Skyrim, Skyrim sold way more on PS systems than Xbox ones.
But that's what those companies do, they use money to get exclusive stuff. Content is king, right ?