I cut off the device-specific side and use them for hard-wired 5v power circuitry projects. Sometimes, I cut off both connectors, and pull out the wires inside

I cut off the device-specific side and use them for hard-wired 5v power circuitry projects. Sometimes, I cut off both connectors, and pull out the wires inside to use for wiring circuits. I plan to combine a Micro-USB B connector and a full size USB-B cable to make a soldered-together usb OTG cable to connect my 3d printer to an android device. Other options. Donate them to schools or hacker spaces. Bring them to recyclers. (Or, if you have lots of free time, strip off the PVC to expose the bare copper to make it easier for them to recycle.)