they have clearly been 'decided' as a couple way before the show itself and are given way more airtime
I'm not convinced this is the case but appreciate that many people think they're a set up.
IMO the producers couldn't guarantee that Jack and Dani would fall for each other. I know psychologists could have had a good guess but it's no guarantee. Also, Jack and Dani are not Oscar worthy actors. They would have to be if they were faking those emotions in the villa.
Jack liking a few Instagram posts and admiring Danny Dyer is hardly a smoking gun.
Sure, they're not "doing bits" but most people wouldn't on TV. Their kisses are fairly tame but I don't think many couples have been full on (Megan and Adam are an exception rather than a rule).
And what possible reason would the producers have for wanting Jani to win? Have they agreed a commission on future earnings?!
I think it's more likely that the editing team are televising the stories that will garner the most viewers and the most column inches. The programme is hugely tied up with sponsorship deals and they want millions of viewers. The app polls and Twitter comments show that Jani are very, very popular. The editing has therefore entered a vicious circle - Jani are popular so they get more airtime which makes them more popular and so on.