There's a lot of such activity rubbish around. For example even a well organised sportive event like the Fred Witton round for cyclists has issues with discarded energy bar wrappers and gel packets. I used to see an load of small, silver pressure bottles as used for cycle tyre inflators on a certain stretch of road splitting two sections of houses with a countryside stretch. I ranted to someone about. How inconsiderate my fellow cyclists were. Until someone pointed out that they were waste product of a certain activity. Can you guess? Nitrous oxide inhalation for personal gratification. Laughing Gas! The legal drug at the time.
So littering is fairly common with activities as in normal life.
So littering is fairly common with activities as in normal life.