Germany enforced this a couple of years ago: if you can contract with someone electronically, cancelling this needs to be as simple as agreeing to that contract. Annoyingly, a lot of companies try to work around this - I tried to cancel a newspaper subscription a while back and they didn't offer that. So I simply wrote a quick email. Then they requested to call me to discuss this and I had to answer via email quoting…
A smilar law should be implemented at EU level. Our DSL provider in Czechia makes it very difficult to cancel a service. You can easily sign up online. But they say you have to call somewhere no earlier than two months and no later than one month prior to expiration which renews yearly. Then they mail you a code, which you must provide to them by calling them again. This is an excellent illustration of how badly everything would be (for example food standards or local laws) if we weren't a part of the EU. Yet some stupid people (mostly old) are complaining about the EU all the time that it is a Brussels' dictate. But the EU creates at least some order here!