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The adverts claim operators can take people to Mayotte using large tourist boats, but victims' families say the smugglers are using much smaller fishing boats called "kwassa".

Derai responded to a "quick cash" advert on Instagram and was put in touch with someone he now knows was a money mule recruiter.

The BBC checked the adverts for the top 45 highest grossing games on Google's Play Store, which along with Apple's App Store are where the vast majority of people access mobile games.

Much of the money would be spent on a national TV advertising campaign, with one advert already in production, he said.

He added that marketing strategies and adverts from gambling companies were "particularly enticing" for people suffering financial hardship.