In the USA clearance is implicit by 2-way comms. But you can also be denied access when your tail number is NOT acknowledged. The radio exchange is different but there is still a right of refusal and we do have to plan another route if we're asked to remain clear.
It is not a public asset for all to share.
And the other half is owned by the government. So don't ya think that access issues to airspace should be addressed instead of resisting it?
Controlled airspace is designed to make more traffic known because it causes safety issues otherwise.
In other words it's obvious nobody's gonna listen if you object on the sole basis you just wanna keep flying around without the radio.
