Cancel Your Subscription: A browser game where you try to cancel your subscription
(www.fundrstudio.com)
Not my experience at all. There are well defined processes, you pay 2 bucks to send a letter with delivery guarantees and its done. Yeah, that's old school and not online, but it works, comes with legal guarantees and has always been absolutely hassle free for me.
That being said, not all EU countries are the same.