@JustaKOS Re: Cooperation
My guess is that MS (I didn't use the $!) need to utilise the ARM market. Working on development with chip makers is not, I imagine, cheap. Here they have the crowd to research, the very techies they need who will play around. Probably far cheaper. And MS, I believe, do make a not insignificant amount from embedded/SoC devices using ageing versions of their embedded software, so this is a good testing platform for the next generation.
RPF get the kudos of possibly channelling a major tech company in the direction of a manufacturer, probably benefiting their bargaining power on price, manufacturing priority etc.
Seems like a happy marriage of sorts. For the moment, until M$ get the lawsuits out or steal stuff . . .