I don't think it would be because of fake views, Harmonizers have been replaying it alot so is because of that, they don't need to pay for fake views, the song is very popular too
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Sorry about it.
:-/
But didn't 1D fans do the same for every video after 'Best Song Ever'? Didn't Britney stans do the same for 'Toxic' and 'Gimme More'? Didn't Katy stans do this for 'Roar'? Pretty unfair if you ask me.