It's also a lot harder to set up any sort of business in most places in Europe, at least compared to doing it in the US. I wouldn't be surprised if this community will become centered on North/South America and Asia.
In the US, you could start selling widgets instantly (all legally, taxes taken care of). Getting an LLC (something like a GmbH/Ltd) set up takes around 1-2 weeks tops, securing a company credit card - a few days.
Source: Self-employed US expat in Germany.