Few years ago a neighbor in my apartment building found out I knew about computers, and he wanted me to "just build his app for him". Being polite, I tried exp

Few years ago a neighbor in my apartment building found out I knew about computers, and he wanted me to "just build his app for him". Being polite, I tried explaining to him that I really don't know anything about app development, I just move and shift data around on servers and draw pictures on whiteboards, but I think he thought I was just being humble. Eventually after some relenting, I told him to email me with the details, and gave him my email address. He emailed me the next day, and "all" he wanted was a website that allowed users to upload arbitrary videos of any length, and recommend fun videos that could be shared, and have a comment system. I replied back explaining to him that that's a lot more than "just an app", requiring a fair bit of server infrastructure and storage to keep all the videos, even if my labor were free. He replied asking how much it would cost to run. He thought it was on the order of like $12 a month. I explained that closer to like $1000 a month to get started, like $200,000/month if it gets popular, not counting the ~$25,000 it would take to get a really crappy prototype built. He stopped talking to me after this.