Uh you're probably thinking of Pi-Hole. That's not an ad blocker, but a network wide bloatware/badware blocker. It does block ads, but on a different level.

TL;DR: it's not an ad blocker, since your computer couldn't even comprehend the ads exist using it.

they only make ads for bad ad blockers
the only good ad blocker is uBlock Origin
there's never been ads about it. only spread by word of mouth (or word of keyboard? idk)