LOL there is a K-Cup machine at my workplace and someone keeps dumping the spent K-Cups (about 30 at a time from the machine's large internal wastebin) into the office compost bin - little plastic cups and all! I can only assume they once heard somewhere that coffee grounds are good for compost. Sigh.
I also struggle with the guilt of using this machine. At our home we keep a
water boiler plugged in (it's on a plug-in timer so that it turns on at 5am & off again at noon). Right next to it we keep our
pour-over cone, filters, and ground coffee. It's just as fast as using the K-cup machine because our
hot water is right there and ready to pump, and it produces no plastic waste. Also more economical than buying K-cups. Our unbleached paper filters and grounds go in the compost daily!