OTCQB companies must be registered with and reporting to the SEC or a U.S. regulatory agency. There are no financial or qualitative standards to be in this tier.
(2) on top of that , transaction tracking sofware would intercept insider buy or sells if any. There are enough websites listing insider transactions.
(3)Only buys are registered with the SEC + detected by transaction tracking software. Or would the software experience a major flaw ? LOL