VC funding is usually a decision to "go big or go home" on a timeframe, while bootstrapping allows you to continue indefinitely at any scale once revenues cover costs. Both have risks but the VC model is explicitly to spend at unsustainable levels in order to try to get big fast. That's kind of the whole point of VC. It isn't wrong or selling out, but you have to know what you're getting into (as founder, employee, or customer). If you spend way ahead of revenue to grow fast, and you don't go big, then you usually go home.