At least on hicetnunc (art focus) it is. You can set your royalties to 10-25 percent of future sales.
Think of it like a processing fee making the platform completely unworkable. Nobody will ever deal with that kind of inefficiency unless they are doing something so desperately illegal that they'd willingly pay that much for the money laundering.
And there's bound to be more efficient ways to money launder. Nope. The artist royalty promise is a pure con.