In addition to that, its likely Sony thinks putting their games on PC is cannibalizing their console sales. There might be a little bit of truth to that, I'm sure there are at least some PC gamers that buy a PS5 just for the exclusives.

They probably did the math and this is the answer they came up with. Did they do the math right? Probably not. I think the huge majority of PC gamers won't buy a PlayStation anyways.