Mod this up.
Here in Italy you can be signed up to costly "services" by simply and inadvertently clicking on an ad on your phone. No sign-up process - just click on an in-app ad and you receive an SMS "You have subscribed to [shady sex chat service]. Each message you receive has a cost of [x Euro]". No - the ad did not advertise any such service. And no, the app itself had nothing to do with it except for serving up ads - this crap comes from the ad networks. Then the messages start to roll in and your friendly phone company automatically bills you for each message you receive. This has happened to various friends and family members. How can someone you never willingly shared your phone number with start billing you via your phone company for a service you never requested in the first place? (rhetoric question) Usually, after complaining with your service provider they will block those messages, some will also pay back the amount. Until one happens to fat-finger the next ad and everything starts again.
Blocking ads is the only sensitive thing to do. Also, I prefer to pay for apps I'm interested in and avoid the free-but-with-ads apps.
I have no problem if a site won't let me view their content without ads -- I don't think they are being clever, but it's their rules on their playground. I'll simply leave and look for alternatives. This means I could never subscribe to such a site, even if they offered something interesting.