You would want to publicize your cure—but then you would meet the AMA and FDA (ah, but I repeated myself :-( ) and get to know them really well...
Large institutions want to perpetuate their existence and grow larger—it is not in their interest to cure disease.
Lots of countries are not the USA. Would China care about the AMA and the FDA? Would Mexico care about BigPharm? The Philippines would love to we the world center for the cure for cancer.
I just don’t buy the conspiracy theories, it would require people to go against their self-interests. If there is one thing you can count on is somebody saying screw them, I’m getting mine.