As the federal government prepares to launch a $349 billion loan program meant to help small businesses survive the coronavirus pandemic, critics have growing concerns that some mom-and-pop shops might get squeezed out. The Paycheck Protection Program — part of the $2 trillion relief package signed into law last week — was billed as a way to help local businesses that often form the fabric of communities retain workers and pay bills. Operators of name-brand hotel, restaurant and service chains and franchises with thousands of employees at locations scattered across the U.S. are eligible.