[WAJ Note: Given the vigorous reader discussion
about Ad Blockers, I asked Jason Boisvert, who has contacted me
via Twitter in the past about auto-play issues, if we could repost his
original blog post, and he agreed.]
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Many websites today have autoplay video/audio ads, even when they aren't supposed too.
This postat the webcomic
Erfworld lays out the basics as to why. In short, advertising networks are paid for ads from producers and host them on their networks. The networks appear on many sites, and those sites receive a portion of the revenue from the networks.
It turns out that the best-paying networks "accidentally" let a larger portion of "malicious" (that is, with unauthorized function) ads through. These ads play audio when the websites running them have demanded no-autoplay, crash websites with long scripts, lock the page so the ad is on-screen, making it impossible to scroll and even redirect mobile devices to the purchase page of whatever they are advertising. Somehow, the networks that pay less don't have the problem of "malicious" ads "sneaking through" and "accidentally" breaking webpages or blasting noise and music.
At the moment, these ad companies are protected. The obnoxiousness of the ads is often related to the uselessness of the product, so annoying or even destructive ads enhance revenue - the terrible reputation of the company is not a factor for someone selling a cell-phone game no one has heard of. Most people won't quit a website for playing an audio ad sometimes, so the ads still get plenty of viewers.