Paying people to clean up rubbish is a brilliant idea! I lived in Thailand for years and have seen the rubbish problem escalating there. My first visit was in 1999 and the beaches were pristine. Fast forward to 2016 and no matter where you went it was rubbish and no one seems to care. Fast forward further to 2018 and I'm in Austin TX, where they won't give you a plastic bag in grocery stores, and yet I still see litter everywhere I go. Such a hypocritical attitude. There's a group here that wants to appear environmentally conscious, yet they can't accept the responsibility of being environmentally conscious. This is the same group that will allow their dogs to shit everywhere without cleaning it up. I understand that it's biodegradable, but you need to have a social conscious as well and consider your fellow human.
I wonder how well your solution would work in both places. Theoretically it should be a win-win. Thailand has a poor population that should be more than happy to get paid to clean the beaches and other tourist areas. Austin has a fairly large homeless population that should also be happy to get paid to pick up all the rubbish by the sides of the road and in public spaces. Someone should be happy to profit from the activity of others pretty much anywhere...that's entrepreneurship right?
Now how to get someone to run with this idea.