Comment by josefx
Money from Google internally might be subject to internal power dynamics and come with strings attached. Having reliable outside funding from people who don't get a say in things might be a better alternative for a project that doesn't want to end up as Stadia 2.0 .
I think some of the external investors have board seats, so the outside people do get a (small) say in things. And to your point, that's probably also a good thing for avoiding another Stadia mistake.