The baffling thing about Stadia is that the business model never made sense for the product and that was apparent the minute they announced it. Why would anyone buy a game for a specific cloud service? Why wouldn’t you do what Microsoft had already telegraphed they were doing with GamePass?
If Google had spent one more year thinking through how the business was going to work they may have had something, but instead they made some tech no one asked for but worked well and and just shipped it.