[chaosjevil]

>Web advertisers seem like a classic case of taking miles when given an inch.

I agree. And for me they're also two (!) good examples of tragedy of the commons.

From the side of the advertisers, your ads are only competitive if they're slightly more obnoxious than your competitors, but as you make your ads more obnoxious you're degrading a common resource - the willingness of the public to put up with your crap. Eventually the public says "this is too obnoxious, I'm going to block it".

And, from the side of the sites showing ads, you'll want (or need) the additional money brought by one more ad. But once you do it, you're creating yet another ad space - making the market value of ad spaces a tiny bit cheaper. And as everyone is doing this, the price of ad spaces drops down to the bottom, so you need to include more and more ads on your platform to stay competitive (or even to stay online).

I would expect governments to intervene in those situations. At the end of the day, a government should, among other things, prevent its citizens from making things worse for everyone, when seeking their own interests. Sadly governments aren't big fans of contradicting megacorps like the Ad Sense (from Alphabet) mafia.