I might have worked for the largest Swiss bank and was responsible for the software that ran their Financial Investigation Unit. This entire department had the mandate to investigate large deposits and accounts to ensure that there was no link to nefarious sources. The reasoning was that they would rather not have the income than be linked to any "criminal or dictator".

I'm not saying it doesn't happen, and it definitely did happen, but Switzerland is no longer the place where dark money is hidden -- that's moved on.