Funding for your Idea without going to VC

> What’s your idea?

How do I know that I won't be cheated if my project doesn't get chosen but my idea gets stolen by someone else instead?

I don't think I can trust ANY site to build my idea for free. That is far too much of a risk for it to be stolen by another person to implement it as a side-project if I don't get chosen.

The idea of 'Facebook' being 'stolen' by another person is an example of this.