How hard would have been to add a simple message, warning people about it and offering to opt out? Most would have clicked OK without reading anyway, and Google could pretend they give a shit about users. Unless they expected blowback, and that kind of message is the "compromise" they want to eventually land on.
They don't want you to opt out. Then they can't brag to the shareholders about Chrome being "AI Powered" You're not even the customer when it comes to Google.
Or at least justify the hundreds of billions they are burning