From where I'm from in the EU this is not the case. All income is taxed, salaries and capital gains the same way and the residency rules are the same. Typically as self-employed you're still considered an employee, they're just interested on how much you make and that they get their share.
A bit sad when you consider the politicians will probably waste your hard earned tax money on more weapons.
Good info! And thanks for sharing the link! I also like traveling, but haven't been to many countries. I'm a follower of several Instagram travel blogs. I should say, they help me to find out many interesting things about other countries and keep in mind places I would like to visit. What inspires you, except monuments?