Its because of GamePass mostly and Microsoft being seen as the most pro consumer platform holder at the moment.
I also think many feel that Sony is unlikely/unwilling/unable to spend, so nothing will be taken away from their platform of choice, while Microsoft will consume the entire industry and we'll be able to access GamePass through mobile phones or Smart TV's, on a cheap monthly fee, while still offering everything multiplatform, with no change to the status quo in the foreseeable future.
In reality, this is mostly applauded by Xbox fans, but I think there is as much opposition to the adoration, that's not just coming from Sony fans. Massive consolidation is going to lead us to having less options on our platform of choice.