I recently asked the founder of a pretty big GIS company how they handle plagiarism. The answer: "we don't bother. [we just monetize services on top of open data.]"

So it looks like the intentional errors method didn't work out in the end. [1]

Wonder if Apple will be as accommodating though :p

https://www.gislounge.com/map-traps-intentional-mapping-erro...