Contenture bet on users being prepared to pay to have ad-free sites. They gave up early; but to be honest their "no ads" scheme wasn't going to work anyway. It relied on a piece of javascript removing common ad blocks from the DOM.
The main problem is reliably identifying who is a legitimate subscriber. I happen to have a robust solution for that problem which this margin is too small to contain.
The main problem is reliably identifying who is a legitimate subscriber. I happen to have a robust solution for that problem which this margin is too small to contain.