TBF if Google locked down the devices like that it would be a GPL violation. Not their first or whatever but still, there's a reason for them not to do that beside "being nice"
It's also because so many Linux developers are on the payroll of big tech. Look at all the submissions. 95% are just big tech. And look at the key people in the Linux Foundation. All a bunch of business suits with compromised motives. Serving their company above the community. There's only a few unencumbered people in there now.
Linux is no longer the community-driven choice. It's big business with billions hanging on the line. The grassroots origins are long over.