By throwing your rubbish in a bin whilst in the USA, you are causing the city to not need to pay a litter picker to collect and throw your rubbish into a bin.

I know I’m just being silly, and I know you’re not wrong, I’m just sayin. There’s a thousand ways one could look at almost any action and suggest ways in which it is “work” if we define it as causing someone else to not have to do a job or get paid for something.