GCP: copycat of AWS, but with less high margin, higher level services, so have been losing money since the beginning (ask some of Alphabet's board members, if you can, and watch their eyes rolling). The only thing that could have given them the advantage - not, not Kubernetes, although K was and is a great thing to fund - was a "cloud in a box" product, so companies could install a rack of GCP in their existing Data Centers, and use it. See "The Cloud Wars of 2017", written by me [0] six years ago.
Stadia: you can't build Stadia without getting into account that the market has one big monopoly (Steam), and a few huge other ones (Xbox, Epic, etc). The strategy has simply been to ignore this simple fact. It's like Netflix building a streaming service, without a huge investment into content as well. Doomed to fail from the get go.
Small rant, no horses in this game on my part; just a pity that two huge opportunities were wasted like this.
[0]: https://medium.com/simone-brunozzi/the-cloud-wars-of-2017-ac...