This might be the case for where you live, but I've see dozens of Lime bikes recently around the Boston area (not in Boston proper, but in Cambridge, Somerville

This might be the case for where you live, but I've see dozens of Lime bikes recently around the Boston area (not in Boston proper, but in Cambridge, Somerville, Chelsea, Everett, etc.) that are just on sidewalks. The main problem is that there aren't really a ton of bike racks around. Usually when I bike somewhere, even in Boston proper, I have to search for a bit to find a bike rack. I imagine it's similar for other cities that don't really have the existing bike rack infrastructure.