I’m starting a business which the idea was derived from an inside joke between my friend and I. The joke mentioned an imaginary product, but we never considered to take it seriously. Half a year later, I haven’t spoken to him in months, and at a hackathon I decided why not work on the idea. Is it unethical to not include him in the business?
I want to work on it alone because I don’t need help to execute with this idea.