Terms of services and contracts are written for lawyers and not the average people.
If your terms require people to get a law degree and take a week to parse the 400 page document, then I would argue that it's a tactic to get people to sign up for the service without fully understanding it.
We need legislation that forces companies to communicate the terms in a way that an average person can comprehend.
I'm an average person and I read them all the time. It's not usually 400 pages long. More like 3-4 pages. If a person genuinely can't understand, they should not use the service. That's not sarcasm, I, myself, do not like to sign contracts I cannot understand -- but that's rare when you can look up stuff.