No one recycles it yet, or so little that no one knows about it. People recycling silver, are in the movie printing plant, or printing store to recycle people developed film wastewater, the silver content is quite a lot, and to others to deal with wastewater, it is reasonable that they should also give you sewage treatment fee it.
Meaning don't say you have a waste of film on hand to sell money, you want to dispose of it but also to give people money, littering is polluting the environment, will be fined (but I guess no one cares)
And, 1 gram of silver is only 4 yuan, industrial impurities more than 3 yuan or so. How much silver is in a piece of film ....