Basically, while you are in theory free to move money around as you please - for yourself or as a service to others - doing so in large quantities will get you scrutinized. If uppon scrutiny there is any doubt as to from where the money came or where it went, you'll be flagged for "money laundering". Once that happens the "authorities" will essentially go with a haircomb through anything and everything you've ever done, and then, uppon dicsovering that you are in fact not a criminal, keep on looking until they actually find something to justify all of that effort they just wasted on you.