The problem with advertising is that the price of an ad view directly correlates with how wealthy the viewer is. Being able to opt-out would essentially make the advertising platform worthless as the only audience would be broke people who can't afford to pay to opt-out and are thus very unlikely to be able to afford your product.
The only way would be if regulation either mandates a reasonably-priced ad-free tier (priced at the average revenue from an ad-viewing user) or other restrictions (GDPR but actually enforced, the website being liable for the ads it shows, etc) that would make advertising completely unprofitable.
> The apps described in the article are effectively recognizing this consumer surplus/need and acting on it.
Presumably, AA is pissed off because the people that value their time enough and have the skills to set up and use an alternative are people they'd very much want looking at their ads, much more so than the plebs who already use the website and see the ads.