This isn't the way that Phil Spencer works, however. If you notice all of their acquisitions so far haven't been so much to deny IP to PS, but acquisitions to strengthen Game Pass.
If you think about it from a business standpoint, this is how you should be thinking about acquisitions.
That isn't to say that MS hasn't in the past done things like this, but at least thus far, this isn't how Phil Spencer operates. Also, if you listen to his various interviews and talks, acquiring a studio to deny IP to another platform is very much not what he believes in.
I feel that if it were entirely up to Phil Spencer and nobody else, then not only would Bethesda games still be on PlayStation, but MS Game studio products would be available on all platforms (including PlayStation). However, he holds the position at the discretion of Satya Nadella and more importantly the board of directors. And they still hold to the antiquated notion that at least within the realm of consoles, MS Game Studio games should remain on Xbox, but at least he's managed to push through having everything appear on PC day and date.
Regards,
SB