That would still be very difficult. You have to know what kind of plastic you have before you can work with it, some plastics off-gas dangerous vapors when cut

That would still be very difficult. You have to know what kind of plastic you have before you can work with it, some plastics off-gas dangerous vapors when cut for example, and they would need to test for chemical contamination before it could be distributed. Also, how many thousands of tones of souvenirs can someone sell? :P