Since we see a "Back" button in the upper-left corner, Spotify in the background, and we do not see the name of another app (if you had been switched out of Spotify you'd have seen "Spotify" in the upper left), I'm going to assume that is an ad delivered by Spotify. Since the "Back," "Cancel,"and "Accept" are in English, I'll make a guess that there was an error in Spotify's ad delivery system that unintentionally presented an ad intended for a different audience.