This is why I prefer filling out a form when I commission than DMing an artist or lacking their ToS. One artist announced one open slot, and I politely requested one through a DM. Then they replied with a question that made me uncomfortable: "Anything you want?" It sounds like not only do they want money, but they want something more that's inappropriate. It's like a setting of a part of a story where the protagonist says they'll do anything, and someone who is talking to said, "Anything?" You know what happens when the protagonist agrees or not. It's like that one part in Family Guy when Quagmire told the producer he'd do anything to get on The Bachelorette. Later, they're in the producer's room, looking like they're about to have homo sex. But Quagmire was helping him check for monsters before going to bed.
The point is, to any artist who does commissions and only be contacted by DM, don't creep out your customers. Just ask them what they want for their commission if you're open, or tell them you're closed this time if you are. Also, be clear on the instructions if you're in a hurry. It's only a suggestion.