You choose closed source and you throw away early adopters - people are way, way less likely to try out closed source software from what I've seen. They'll even resent you for it.
You choose open source with a permissive license - you bootstrap, get users, and some larger company comes along and essentially takes it from you.
You choose GPL3 or some less permissive license and no one will ever use your software.
How do you see this working?