I tried to report a competitor for vote manipulation last month. They have ~20 answers that have the same ~10 users upvoting every answer (and no other answers). In response, they closed my answers ️.
Similar to the tool AppViz2, except open source. Downloads sales, reviews and rankings. All data is stored locally on your own system. I've been using it to track my own sales (and competitors ranks) for a few years now and figured I would open source it.