Assuming it actually works (which I'm not sure about), it increases the cost on the business putting up the ad (presumably targeting you). It acts as a small punishment to the business buying the ads I guess.
It also pollutes the data collection on you by advertisers. If you're seemingly interested in EVERYTHING they have no clue about you.
>Assuming it actually works (which I'm not sure about),
Which it probably doesn't, given that it uses XHRs to "click" on ads, which is super detectable, and given the proliferation of ad fraud I'd assume all networks already filter out.