It's not your property. You don't own OpenStreetMap. It is mystifying how when a government allows someone exclusive rights to a property of land how many believe they have become the arbiter of reality. Anyone can make a map of your property, and even if it were illegal for them to do so (it's not) you have no recourse. With that said, deleting valid data is a form of computer vandalism, a felony crime. What Amazon does with the data they download is their problem. I know many of us mappers take issue with Amazon too, but it's none of our business if they use our data to make bad decisions.

Furthermore, detailing your property is not done to "make a point". CurlingMan13 is probably trying to improve the quality so that Amazon does not trespass. Fences are fair game for the map.

Even if it were about pettiness, you could just choose to give your neighbors the same mapping treatment.