Haha some source, you are referring to it as some shady source. Do you mean to ask if we could launder our crypto via these physical stores to buy things? As if we could get the product they are selling and sell it to someone else for fiat, it means we successfully laundered our money. Well, if that's what you are asking, then as a business owner, I would love to use centralized exchanges for payments.

Because at least these exchanges have some AML and other parameters in place that can save me from black money or money from illegal sources, plus it will be beneficial for both parties to transfer money from exchanges as it can reduce fee to none.