I recall that for a decade or more there were third parties selling remanufactured LJ4 cartridges. I had someone explain to me we don't throw away the empties b

I recall that for a decade or more there were third parties selling remanufactured LJ4 cartridges. I had someone explain to me we don't throw away the empties because we get a deposit on them. No such thing with the 4k?