It may be a billion dollar problem but it's a billion dollar problem like tax software, it wouldn't exist without the troll demanding his toll. The resources could be used elsewhere like on curing disease or on educating people: http://www.americanbanker.com/bankthink/money-laundering-is-...
It's a billion dollar problem that doesn't need to exist.
Many people will probably make cursory argument that taxes(and by analogy ML regulation) are a necessary evil(They're now doing the troll's work for him)— I'd argue they are not necessary and they short-circuit us working on better replacements.