Email notifications are only sent once a day, and only if there are new matching items. For the past four years, Jamaican-born chef Ras Rody was a fixture on the Tampa Bay, Florida, area’s food scene.

When Chicagoan Laura Yee supplies brownies for a potluck, people wonder if she baked brownies, or brownies with a secret ingredient. “Everyone always asks, ‘Is there weed in that?’” she says. Her ...