Only issue is that I am not sure they are recycleable anymore. But it is a small strip of cardboard and metal - so probably doesn't move the needle anyway.
Could be a slippery slope. It is just a plastic cup, a straw, a thin piece of metal. Overtime those can build up especially if the volume rises. Should RFID purchasing in this manner really take off, it could be like plastic all over again. Which would create another environmental concern: Mining the metal for the tags.
