The essential liberty is being able to use a device you own how you choose to use it, and not the rules for its use being dictated remotely by a giant corporation.
See: Google’s Web Environment Integrity proposal.
The thing is, like the person I was responding to was pointing out, most people don’t give one shit and don’t pay attention to moves like these, because they prefer the convenience over caring about lack of personal agency in the equation.
See also: Reddit API protest, which most redditors didn’t give one fucking shit about.