Have they disappeared?
The last two restaurants I’ve ordered them, they sent out those Argentine red shrimp without the head on them. Most recent time was at a seafood restaurant on the coast. There aught to be some sort of way to hold them accountable for false advertising.
You can if you can prove it. In AL I believe there’s a law requiring them to disclose the country of origin of seafood.
But no they haven’t disappeared. They’re just rare and very expensive.