I found a movie using music with “audiojungle” vocals; I don’t know if this behavior constitutes infringement and whether there will be a corresponding reward program for the whistleblower
It would depend on it the creator has the right license and just used the preview copy.
Either way there is no rewards for whistleblowing other than a sense of well being.
If you do it many times then there is a copyright ninja badge but this takes a long time and many instances both on and off the marketplace