A loyal customer’s years-long habit of saving up rewards points ended abruptly when a quiet policy change decimated his account balance. Aaron Braun, a Massachusetts resident and regular at Dunkin’, had been banking rewards points on the chain’s app for years — more than 93,000 in total. He planned to let his kids use them for free breakfasts on their way to school, now that they had driver’s licenses of their own. Must Read But then the rules changed. Last fall, Dunkin’ updated its rewards policy so t ...