Kinda like how Widevine works. No keys means lower quality.
You'll be filling in captchas 10 times a day, getting randomly locked out of your Google account in the name of security, and whatever new feature they add to their services, they'll find an excuse to require the DRM for it.
Then, people will DDOS the attestation endpoints because why not.
The end game is probably integration with a TPM that produces the token, or at least whatever part of it verifies that the chrome binary is genuine and that there is no forbidden software running on the client machine.
That is exactly the goal of this, and why it needs to be opposed fiercely.