can we just leave the guy alone and let him enjoy his anonymity and peace?
Exactly that is the best way.
The best life is when you have a lot of money and no one knows about it. With that, you can go to any party without anyone knowing you and bothering you. If you are popular or famous, it is very difficult to go shopping alone in peace without being bothered by anyone. It is great when no one knows what your financial options are or what decisions you can make. If someone lives like that, they live a wonderful life in peace and will i think he/she/they help other people.