Until before the second to last paragraph, I'm fully with you on this idea. Especially when using the bike it's very frustrating that there is no (ideally low-friction) way to report people parking on bike lanes.

But I think that something like the 30% kick-back will result in a massive increase of people who will somehow construct issues artificially, just to make more money. IMHO it should be plenty to just provide a simple way to report actual annoyances.