Was it to secure games they would have gotten anyway? Was it to get said games on gamepass? Nothing preventing that from happening anyway.
The only evidence pointing at what their actual intent was is the actual end result: those franchises are never coming out on playstation again.
Cut the crap.
Copying from a post I made in another thread
1. They were looking to sell, and another company buying them might not be good for Microsoft
2. They add significant value to Xbox
3. They add significant value to Game Pass
4. It helps their current studios by being able to collaborate with Bethesda
5. It helps Bethesda games benefit from collaboration with Xbox's other game studios
6. It includes some super popular IP like Elder Scrolls, Fallout, Doom, and Wolfenstein
7. They now own Bethesda's tech like their very popular id tech engine
Whether you agree with all of these points or not, they are all reasons why it would make sense for Microsoft to buy Bethesda. And they secured more games than they would've gotten normally, considering with the way Bethesda was going it's quite possible less commercially successful studios like Arkane or Tango might have been closed or restructured in the future. Not to mention greater financial stability and flexibility allows the games to be made closer to the developers' vision, and with more polish. Also considering Google and Amazon still exist (at least at the time before the acquisition they were both investing in gaming) it wasn't out of the question for one of them to buy Bethesda and for Xbox to get none of their games going forward
That being said, if you think Microsoft decided to spend 7.5 billion dollars just to be petty and stick it to Playstation gamers then you are too far gone in the console wars and I can't help you. Xbox gamers are getting a better experience than they were before that purchase, and it has nothing to do with the games being exclusive. Acquisitions help developers make better games, timed exclusives don't. If Bethesda was fully healthy and could stay independent forever without shutting down any of their studios I would've preferred they stay independent, but it doesn't seem like that would've been the case, so an acquisition by a company that is investing in gaming is a good thing, and I would've thought the same thing is Sony was the one who bought Bethesda