It's all about due diligence. Selling gift cards for bitcoins isn't illegal. However, you need to be aware that it can be easily exploited for money launderin

It's all about due diligence. Selling gift cards for bitcoins isn't illegal. However, you need to be aware that it can be easily exploited for money laundering, and you need to take steps to prevent that. And don't think money laundering is something that just happens in the movies. It's a very real problem, and deserves being attended to. As for your car example, I'll leave that to the other comments already rebutting it.