Who started “Pennywise Dancing”?

MAFDOMiNUS, on YouTube, Sep 8, 2017. It reached 6 platforms in 2.1 years.

LineageKey steps, 10 of 17. Lines follow time and platform
Warner Bros.Before the first postPennywise the Dancing ClownMAFDOMiNUSFirst postIt audiences123.4M $123.4M parent-film openingPlatform jumpPlatform jumpPlatform jumpPressOwner responsePeakAfterlifePatient zero