Ask HN: What's your reason for doing a startup? Money/Independance/Technology?

What moves you to bootstrap your starup up?

Is it money? The feeling of working for yourself? Want to shape the world? Prove yourself you did it? Impress others? Other reason?

Seriously, at several points in my life, the reasons to bootstrap a startup have been different, and would like to know what your reason is.

Thanks a lot