If the question is what I would actually do, I'd probably offer "computer tune-ups" as someone else suggested. That, or set up and secure wifi routers. A lot

If the question is what I would actually do, I'd probably offer "computer tune-ups" as someone else suggested. That, or set up and secure wifi routers. A lot of people are afraid of wifi routers because they've heard the person next door can get them in trouble; solving this problem is of definite value to them. Once I did this for someone whose house was big and radio-interfering enough to require repeaters; I made $100 in an hour. If the question is what would make the most money, I'd print up a bunch of official-looking flyers and an official-looking record sheet, go to some high-traffic spot, and collect "donations". This is very unethical, but it probably earns money the fastest of anything that can be set up so quickly.