Damn, that's nice. In Germany it's enough to have the intention to make money outside of regular employment. You won't pay taxes until a certain amount is reached, but you'll have to get a business license and fill out tax forms every year. And if you don't register yourself as "Kleingewerbe" (small business below 22k €), then you'll have to do sales tax too.
There are lawyers and some very shady businesses, that sweep through the web and report anyone who doesn't comply to any kind of law. They actually make money with this. When i had a small business, i've got a cease-and-desist letter from a lawyer of a "competitor" because a single link in my imprint page wasn't clickable. I guess that's why so many people are afraid of starting a business...
There are lawyers and some very shady businesses, that sweep through the web and report anyone who doesn't comply to any kind of law. They actually make money with this. When i had a small business, i've got a cease-and-desist letter from a lawyer of a "competitor" because a single link in my imprint page wasn't clickable. I guess that's why so many people are afraid of starting a business...