What do you mean by inevitably?
Games from 3rd party devs that release cross-platform because they want to maximise their money and haven't much to gain by limiting their content to one platform, by and large. Starfield would have come to PS if MS didn't buy Bethesda - it was inevitable; they wouldn't exclude a potential millions of sales(unless moneyhatted). Now we'll just wait and see.
All the third party deals prevents games from coming to another platform.
Paid for exclusives is a different topic to studio buyouts.
So Sony can buy whatever because
they are not that kind of games or
don't sell on Xbox
No. That's not the argument that was written. You presented confusion over why reactions are different to Sony acquisitions over MS. I've tried to explain, giving a great, simple reference, "check the release history of the studio and see if they were releasing multiplat titles or not." This would apply to any hardware vendor securing talent - if they are buying up studios that have a solid history of being multiplat developers, that means those studio no longer being multiplat, which is
qualitatively different to buying a studio that hasn't been multiplat for 15+ years.
The discussion about securing second-party exclusives is different to studio buyouts, although similar, because a company paying for a unique exclusive isn't as bad as a company paying to make an existing multplatform IP exclusive as there's nothing
removed from the other platform in the former case.
And before you try to extend another platform-bias, "I'm unfair" argument to my discussion, I'm against platform exclusives full stop. We're at a point now where the boxes don't matter and there's no reason locking content to a specific piece of hardware. Disney buying studios and requiring a subscription is one thing, but if they then decided you need to buy a Disney TV to watch them, that'd be bollocks. That's what we have with consoles now. It's an evolution of what consoles were based on, which they had to be back then with diverse hardware but the market has changed, the hardware has changed, and now it makes no sense. Gamers should be required to get a box, and on that should be able to run whatever games and services they choose (as appropriate to the performance level of their hardware). They shouldn't need a Netblox device to play Netblox games, only a Nebflox sub or to buy games from Netblox on their existing suitable device. Likewise, if they have a machine capable of running Netblox and Plisney+, they shouldn't need a different Plisney+ box to play Plisney+ games, just the subscription or buy from them. Any moves to use software to force people into buying environmentally significant hardware are wrong IMHO. We don't tolerate it in any other media, and now software is suitably abstracted from the hardware, it makes little sense to tolerate it for games too.
Against that personal opinion backdrop, it's very obvious that Sony buying Housemarque is not the same as MS buying ID Software, let alone the entirety of AB, unless MS don't produce any platform exclusives and don't use this acquired software advantage to leverage users into buying their hardware.