It literally lists countering ad-blocking as a use case.
Users like visiting websites that are expensive to create and maintain, but they often want or need to do it without paying directly. These websites fund themselves with ads, but the advertisers can only afford to pay for humans to see the ads, rather than robots. This creates a need for human users to prove to websites that they’re human, sometimes through tasks like challenges or logins.
Unfortunately what’s going to happen in reality is that any non-standard ad consumption (including non consumption) will be flagged as fraudulent. “We cannot verify your activity, please disable your add-ons to continue”.