If they set it up so it's a "preemptive return" of things that came from your wishlist to a predefined address they could likely work past the spirit if not the letter of the law.

I can envision an email that says "Aunt Milly is sending you a gift from your wishlist. Would you like to know what it is? Yes? It's that Gumby boxed set. Still want it? Ah, you bought it for yourself at Walmart. We'll make a note of that, you disloyal bastard. Ok, we'll just send you a gift card and a preaddressed envelope that you can use for that thank-you note you'll send to Auntie."

It's a money-saver for them; every return they have to deal with is a drain on the bottom line.
It's a win for the nephew; who needs two Gumby box sets?
Aunt Milly will never know.

You are aware, Congress, that you can't legislate the advace of technology right?

"I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to the Earth."
-- Pres. Kennedy, May 25, 1961

You certainly can't legislate innovation, but you definitely give it a helping hand by:
a) encouraging it, and
b) funding it

...both of which help a lot.