The moment you try to look into the fines governments impose on banks caught money laundering and the rare cases in which bankers actually see a prison cell, your last option is the most likely one, with a sprinkle of the two others.

My main issue is that all the AML/KYC/KYB barriers we have to deal with never seem to be subject to efficiency tests, all the studies I read and the few audits of these system seem content with it's likely better than doing nothing... but never measure the lost opportunities in trade/business they cause.

In a way it's the same hopless fight against so-called piracy for movies/games. The motivated actors who want to break the law find ways to do it at a large scale, mostly without consequences... and the honest people are just hindered when they want to use their content (even lose access to it when DRMs rely on the existence of the developer/publisher and their goodwill to maintain it way past the time when that media was able to generate revenues).