You consent to their terms of service and privacy policy when you access their website by your continued use. They disclose the collection of browser behavior and more in the privacy policy. I suspect they are covered here but I don’t specialize in EU policy.
Their terms of service have to be compliant with local laws though. You can’t just put whatever you want in there and expect it to stand up in court.
This is true. And I’ll disclaim again that I’m not an expert on EU law or policy. But I’m not familiar with a US policy or law that would preclude that consent to collection from being a condition of use. I’ve written these policies for organizations, and I think it will be a difficult argument to make. I’d love to read an analysis by a lawyer or policy writer who specializes in the EU.
Assuming it didn’t exist for months or years before this. As far as I know, blocking ads has always been against ToS.