For every guy who pulls off the "contribute to open source" meme successfully, there are a hundred entering the field by just getting a degree.
Yeah, it's *possible* to do it without a degree. But it's a lot easier with one, and when you can pick up a legit BSCS in less than a year for less than $10k, most of which can be covered by pell grants, it's pretty dumb to take the hard road.