Mark Ely saw an opportunity, and he took it.
The day after the Supreme Court ruled against Aereo in a copyright case brought by the nation's major broadcasters, Mr. Ely was trying to scoop up Aereo customers by promoting his start-up, Simple.TV, on social media. "Former Aereo customer? Join the Simple.TV Family," the company wrote on Twitter on Thursday.
"We're telling Aereo customers: 'Your favorite service is going away. Here's an idea that isn't,' " Mr. Ely, who started his company in 2011, said in an interview.