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Android apps that should be innocuous are pimping smut by way of slack supervision of their advertising networks, with two app authors complaining to The Register that the root of the problem lies with The Chocolate Factory.

The authors of two popular Sydney public transport apps told us Google’s app monetisation service AdMob is failing to catch disallowed advertisements that should be easy to spot for the world-dominating ad-and-click network.

Malvertising is a rising problem because users are turning to ad blockers as a security precaution, both to protect against malware and to keep material they deem inappropriate out of their eyeballs. The latter outcome is made necessary by ads like those below, which The Register has observed in the Arrivo and TripView public transport timetable apps, both of which are likely to pop up on minors’ phones.

If, as it seems to this untutored eye, the ad got past filters by presenting its text as an image with extra space to defeat character recognition, Google deserves its backside kicked through all the letters of its Alphabet. Twice per letter, once per language.