Even if you could come up with an "objective" definition of what counts as an advertisement, what incentive do site owners have to be honest about it? Likewise,

Even if you could come up with an "objective" definition of what counts as an advertisement, what incentive do site owners have to be honest about it? Likewise, why would I want my browser to tell the site that I'm blocking ads? This idea reminds me of the Evil Bit: https://datatracker.ietf.org/doc/html/rfc3514 https://datatracker.ietf.org/doc/html/rfc3514