The business is still in its infancy, with the biggest players — Blue Apron and HelloFresh — less than a decade old. But they're facing serious challenges from restaurant and grocery delivery services, smaller niche players and even home chefs. The struggle intensified Monday, when Blue Apron announced that it could be delisted from the New York Stock Exchange because its closing share price has been lower than $1 since early May. The company's share price closed down 8% Monday to 68 cents.