I don’t see offshore leeks as a big deterrent, unfortunately. The three big ICIJ leaks were not published as in dumped to the public. Only politicians, PEPs, obvious money launderers and some obvious other criminals were selected and exposed. (It’s only money laundering if you can proof the money comes from the proceedings of crime)

There are some criminal service industry leaks that are public, or have been public, yet it doesn’t appear more than a few individual have the motivation to follow trough in combing them. At least this is true for groups who would publish on their findings.