Because Microsoft has completely transformed their first party line up (not bearing fruit yet, to be fair, but only a matter of time) and will soon be offering the likes of Starfield, Elder Scrolls, COD etc for free, day one, as part of the GP service they seem determined to throw hundred of millions at.
Why exactly do you think they're doing that?
It's because they want Sony's market share. That's a scary prospect when they've got basically endless cash reserves.
It's obviously a dangerous time for Sony, especially because their whole company relies quite heavily on PlayStation. That much just seems obvious to me.