Not surprised. It's more common than people realize.
There is actually a whole community surrounding "borrowed" music production software and tools as well, not gonna linky it though.
I don't think its as huge of a deal as people are making it. Just because EDM is on a global "mainstream" scale (for) now is the only reason people are noticing these things now.
BTW I don't care what y'all say...
Steve Aoki, he's so chill and down to earth.