Starbucks boosts loyalty membership by 13% following switch to spend-based program Rob Williams 5 years ago Starbucks boosted its loyalty program membership by 13% to 16.8 million people during its latest quarter. Read more…. Share this: RelatedUnited relaunches MileagePlus X frequent-flier appJanuary 12, 2019In "Mobile Apps"Chipotle spurs 5x surge in loyalty app downloads, analyst saysApril 2, 2019In "Restaurants"Apple Pay surpasses Starbucks as most popular mobile payment appOctober 24, 2019In "Payments"