Would you look at that, privacy preserving advertisement!
Let’s take it one step further and go really crazy with a/b testing
<a href="company_url/campaign1"><img src="funny_picture.gif"></a>
<a href="company_url/campaign2"><img src="different_picture.gif"></a>
You haven’t heard about the Brave ads that let you slowly accumulate tokens that you can then use to tip creators or websites? I’m not saying it was a good plan, or an ethical plan, but it was… You know, something.
Unlike what Mozilla did, Brave didn’t enable this by default, but they heavily marketed it as a feature.
If Mozilla implemented some kind of tipping system, that could be interesting. Apparently, such a system already could exist under GNU Taler too.