The price was agreed upon in the same way that the price in the grocery store is agreed upon.
The content provider set the price, in this case, the price being consuming an advertisement.
To be totally clear, I absolutely advocate for piracy in some situations, I’m not going to get into the weeds and talk about the specifics when I do or do not advocate for it, but to extend upon the grocery store analogy, there are also some situations where I would absolutely advocate for someone to steal from the grocery store. And I’m not going to get into the weeds and talk about the specifics for when I do or do not advocate for that either. The point though is by calling ad blocking piracy I’m not making a moral judgment on whether or not it is right or wrong, I’m just pointing out that it is functionally the exact same thing.