"The biggest complaint most developers have with Stadia is the fear that Google is just going to cancel it"[1]
You don't even get to see the terms and conditions unless you apply to be a developer and are accepted. That's scary. Maybe the big guys get better terms. Then there's the Google "I am altering the deal" approach to terms.
Google already has a cloud-hosted game product - Improbable's Spatial OS, a back-end system for large MMOs. Improbable raised about $2 billion to develop it, and it's used only by a few indy developers, two of whom launched, got some users, then shut down their game. Cost too much. Runs only on Google's servers. There are some games in development for it that might launch someday. (I liked the Improbable technology concept, but they spent so much VC money developing it that it's now too expensive to use. The investors are going to have to take a haircut.)
[1] https://arstechnica.com/gaming/2019/11/stadia-launch-dev-the...