Depends on your country. In Germany: Extremely. Probably a few seconds of uploading (of a movie or porn, don’t think they care much for other things) will get you a letter (edit: C&D + damages, courts see it as commercial distribution, so the letter blackmails you to pay 300-500 € instead). Or you can use a VPN.
As I said in another post, I like to pay when given the option and I don’t have to jump through tons of hoops.