Why are you expecting 20 years of free service? Even if it's a penny a day, that's 60$ over 20 years supporting a user with no intention of spending any money.

Why are you expecting 20 years of free service? Even if it's a penny a day, that's 60$ over 20 years supporting a user with no intention of spending any money. If you still have the code, you can always deploy it again.