The issue of fake licenses is much worse in the Maritime Industry. Things are getting better only because the Insurance Industry has become the de facto regulator. They are refusing to insure some high value cargos unless the ships officers hold competency documents issued from an approved list of countries, which are almost all in the Western Hemisphere.
The difference is that except for China and Russia there are no equivalents to “flag carrier’s”. Shipping companies are businesses and they can’t survive in a very competitive market if they can’t get insurance, or at least get it at a reasonable rate.
The demise of flag carrier’s is being accelerated by the pandemic. Airlines operating on a purely competitive basis can’t afford Parker pen pilots, and the company leasing them the airplane have an interest in competent aircrew, so I think this problem will slowly resolve itself due to action by the insurance companies and leasors, while the regulators watch from the sidelines as usual