The Relay for Reddit app was catalogued by the UXP2 Lab over the placement of its adverts. According to the entry, for users who have not paid for the ad-free version, adverts periodically appear at the bottom of the screen in the same position normally occupied by the “refresh” and “sidebar” buttons, so a user may tap the advert out of habit.
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Relay for Reddit: Ads.
“Ads periodically appear at the bottom of the screen if the user has not paid for the ad-free version. The placement of the ad when it appears is where the “refresh” and “sidebar” buttons are usually located, so the user may accidentally touch the ad out of habit.”