Most of the really simple businesses are going to be B2B in very niche markets, so you're not likely to hear about them. e.g., somewhere there may be a website

Most of the really simple businesses are going to be B2B in very niche markets, so you're not likely to hear about them. e.g., somewhere there may be a website that converts RS274 commands to an obsolete CNC command protocol so they can use their decades old machinery with modern CAM software. It has real value to a small number of users and it's the kind of thing you can write in an afternoon, but outside a small community, you're not likely to know about it. Yeah, I know that's a bad example, but it's the first thing that came to mind :-)