The way Bob Singh sees it, the taxi industry has drastically changed, but he and other cabbies are still playing by the old rules, struggling to stay afloat as ride-hailing companies like Uber and Lyft dominate the market.“Financially, it’s devastating,” Singh, 57, said.But in the last few years, ride-hailing drivers have hit their own speed bumps. The app-based companies control their fares and the trips available to them, take an ever-changing…