Top iOS ad blocker Crystal lets advertisers pay to bypass restrictions

The policy stems from a deal Crystal developer Dean Murphy forged with Adblock Pro creator Eyeo, the Wall Street Journal said. Eyeo does maintain an "acceptable ads" standard limiting intrusiveness, but over 70 companies, such as Google and Microsoft, have reportedly paid to skip past filters. Users can enable full ad blocking by disabling the "acceptable ads" option.

Over 700 businesses have ads that could potentially allowed through, Eyeo commented. The firm is paying Murphy a flat fee each month.

Murphy claimed to the Journal that he wants people to be able to support publishers, most of which are still dependent on ads for income.

"Given how popular Crystal has become, it doesn't provide any way for users to support publishers," he said. "I decided that's a good feature to provide, and from what I've seen the 'acceptable ads' policy doesn't let through what I'd classify as bad ads."

The app has already generated about $75,000 for Murphy, despite costing just 99 cents and having been out for a single week.

Many publishers have expressed concern about the advent of ad blockers in iOS 9. Although such blockers have been available on other platforms for years, the iOS market is large enough that losing ad access could do serious harm.