For many things we have been doing with bitcoins in the USA, you would be running afoul of our lovely labyrinth of financial compliance laws that require you to either give all of your customers a financial rectal exam, or let the government will give you one, sans lube.
This true of most 34 FATF member countries. While no-one has yet adopted all of the FATF 40+ 9 AML/CTF recommendations in their entirety, there's a significant standardisation of adoption in Western countries in particular. There are also memorandums of understanding between nations and provisions in trade agreements which effectively mean that other nations adopt similar financial compliance models to those of the US.