I think it was actually just a straight mobile clone as I see "WigglyPaint" in the screenshots and the original Android app was called WigglyPaint as well based on the url (/apps/details?id=io.wigglypaint.android). Probably got more popular than they were expecting and decided to pivot a bit.
I’m curious if this article is directed towards them or the clones that are impersonating the WigglyPaint brand.