I hate to ruin the spectacularness of some of these dunks like Anthony Edwards, or the guy that teabagged Reaves. But a lot of these are offensive fouls. Like pushing off the guy with the off arm etc. IIRC Blake Griffin started this years ago, at least getting away with it, when he did amazing dunks but just shoving the guy out of the way with his off arm. But now it has become so prevalent it’s not even questioned anymore.