There's no suitable metaphor for ad blocking IRL

Sure there is.

Every week, your community puts on an old movie in the town park that everyone can watch for free. You, an avid movie enjoyer, watch this movie every week.

But, the movie equipment isn't free. To make this event happen, the community accepts a donation from The Church of Microwaving Babies and Kicking Puppies. In exchange, the Church of Microwaving Babies and Kicking Puppies pauses the movie every 50 minutes and puts on a small two-minute presentation about why you should consider joining and what puppy-kicking can do to improve your life.

You don't care. You do not agree with their views, and you definitely are never going to join. Instead of paying attention to their mandatory presentation, you stare at your phone and read Lemmy. Then, when the movie is back on, you once again pay attention.

That's ad-blocking. Some group gains revenue from their publicly available service by having an advertiser peddle their crap through said service. You take an active role in ignoring said crap, while most people just sit there twiddling their thumbs and pretending to care. The only tangible difference between you ignoring the ad while it plays and you blocking it is 60 seconds of your time and the bandwidth required to serve the ad.

Advertisers don't like it—but fuck the advertisers. The difference that you as an individual makes in how much money is made through advertising is less than a hundredth of a cent. If the impact of the collective using adblockers is enough to be an issue in sustainability, then advertising was not the correct business model to begin with.