Obviously a response to Microsoft's acquisitions and kind of funny that this studio once by owned by MS and Acti-Blizz ends up with Sony. Sony says they'll remain a multiplatform studio, but we all know that won't last forever.
Reminder that industry consolidation is a direct and inevitable result of big tech encroachment into gaming. Capitalism bad for games.
A US-centric IP with enough of a player base that they can have a COD for Destiny deal with Microsoft. Given that Sony can't get away with a bigger merger than this at the moment, it's probably their best strategy.