Droplr makes it easy to share files with friends, but that simplicity doesn't come cheap, it seems. The company has revealed that it will discontinue its longstanding free tier next week; after that, customers will have 30 days before they must subscribe to a Lite or Pro plan. There are a couple of incentives for veterans to fork out some cash, though. Any existing Droplr members can get a 30 percent lifetime discount, and a referral program will let users earn free Pro access. The shift in strategy won't please those who've been thriving on free sharing for years, but there are plenty of alternatives for thrifty types.