DJI was tryin to
(and succeeded GREATLY) become the WORLD market leader in consumer grade UAS. As new &tougher regulations were in the forecast they took it upon themselves (maybe not accurately) to install GeoFencing to try and keep their product on the cutting edge and to PREVENT their product from being the one showing on the evening news flying into an airport etc. From a Big Picture standpoint they made the right decision and far more people Approve of and Appreciate the "half way decent" GeoFencing than those who do not. Our forum members & posts are slightly jaded as the vast majority of us come/came here because of a problem or grudge to begin with.
On a side note... I wonder how many UNKNOWING Dangerous/Illegal flights (legitimately) have been kept from happening because of DJI GeoFening? I'd say A LOT!
"Maybe the FAA gives them some sort of perk?" LOL! That's a good one

If they were in bed with the FAA their GeoFencing would be a lot more accurate and mimic the FAA's restrictions a lot more closely.