According to the Article, what is one reason why Etsy officials stopped selling artwork made by some Alaska Native artists?

Etsy sells items from around the world but has a rule against selling products from too many U.S. artists.
Etsy shoppers complained that the company was selling products made from walrus ivory.
Etsy leaders decided that the company needed to follow U.S. law, since it is based in the U.S.
Etsy has a rule to keep people from selling items made with parts of species that might die out now or in the future.

Etsy leaders decided that the company needed to follow U.S. law, since it is based in the U.S