I'm wondering why a company like Microsoft didn't try this who I feel is far better poised to create something like Stadia. They already have publishers for bot

I'm wondering why a company like Microsoft didn't try this who I feel is far better poised to create something like Stadia. They already have publishers for both Windows and XBox so they could support anyone one of those platforms on cloud infrastructure so that it's no cost to the publishers. Microsoft also has the necessary cloud infrastructure as well as a player base. So, if this product makes sense, what's holding them back?