You are crazy rich. You have millions to burn on some VC. You have an idea for software that is actually legitimately useful and world changing. Screw a startup. Just start an open source project. Changes the world, makes people's lives better, creates an organization of lasting value, isn't a startup.
Why do all these commenters seem to think you need a for profit company in order to make things? The Internet is nothing but billions of things that have been made for free in people's spare time. I want nothing more than infinite spare time to make whatever I please as I please as I relax in a tropical paradise with the people I care about. Startups are the opposite of that.