They threaten to picket the stores if they don't give in, so the stores drop products. They are egged on by wealthy 'environmentalists' like Julie Packard and her Monterey Bay Aquarium 'activists'.
Of course it helps that Julie Packard owns a food manufacturing plant that makes 'vegetarian' seafood. She's hoping you quit buying the real thing an buy her stuff.
Well, Julie can bite me.
Oh my, she would be eating meat.