The entire answer is "We can only pay for Web Services with advertising so we do all these crappy things to the user experience to keep the lights on."
You want free web pages, organizations want to eat and sleep. 2016 is the probably the first year where the Ad Warz have gone really really hot. I predict that by 2017 or 2018 at the latest many of these sites wont even talk to you unless you pay them money directly. The only "free" content you will get will be re-hashed (perhaps algorithimically) stuff which has no actual value but all the keywords you searched for.
