Starlink also has to contend with the laws of physics (in particular, the maximum density of ground stations is quite low). It's a service for rural customers and a select few urban/suburban customers at best. It's not a mass-market technology that's going to put cable/fiber ISPs out of business.
There's no beating the laws of physics here. RTT in normal installed titles with modest system requirements is already an issue for gamers, let alone the latency this requires. Maybe in a few years when something like Starlink is in wide use, this can be revisited.
I really don't get who Google's target market is for this. A flat monthly fee I can see, that's what Playstation Now and, I think, XCloud is doing, but requiring full price purchases on this platform is lunacy.