Far from me to want to put Microsoft on a pedestal, but it always felt like neither liked playing fair. WP eventually got a third party Youtube app that kinda stuck for a while, but it was paid (and actually decent) and AFAIK it never got any attention from Google, which to me always felt more like Google was trying to be an ass and protecting their revenue... but mostly their Android revenue.
I was around when Project Astoria almost saw the light of day and I assume Google came back to shoot it down in a similar way (which would be really nice karma given MS patent story)