At that time, I enjoyed writing software only I would ever use. I can set up auto start myself ; I can log with CSV format and write a tool later to process it

At that time, I enjoyed writing software only I would ever use. I can set up auto start myself ; I can log with CSV format and write a tool later to process it ; I can hardcode my exclusion list. I would still get enjoyment from the project doing all of those things. And using the clipboard API could open up my next project idea. Implementing every feature the Prof listed sounds like something I would only do for money. Even professionally, there is still use for code that only ever gets run by its original author.