“Amazon stepped into e-book rentals in 2014 with its $10-per-month Kindle Unlimited service … But a small competitor named Scribd started even earlier and offers larger quantities of popular content – for a buck less. In the past year, it’s grown subscribers by over 40% to 700,000 (still well behind Kindle Unlimited’s estimated 2.5 million-plus) and has started making a steady monthly profit. After introducing unlimited reading and then moving away from it, the company is bringing it back, with some limitations designed to make it economically viable.”