Instgram followers doesn't mean one sport is more popular than another. Some shitty rappers I never heard off have millions...younger kids and generation nothingness spend more time on insta and facebook.
Take tennis .The top stars have 400/500k followers each (Nadal, Murray....etc) Come wimbeldon tickets sell for 2k a pop with A star actors and royalty in attendence and sponsors like Rover, Rolex...etc throwing tons of money and world wide screenings. Same with golf, F1...etc.