They're free to use or modify anything you post
In order to post that very unique sunset pic with a Valencia filter, you must agree to grant Instagram a royalty-free, worldwide license to use or modify your photos/videos/audio any way they'd like. You also waive your right to participate in any sort of class action lawsuit against the company.
They reserve the right to disclose your information
There's a cost to all that sweet, sweet binge-watching besides bedsores and losing friends: privacy. Turns out that Netflix has the right to disclose all of your personal info to third parties (i.e., law enforcement or the government) should they deem it necessary.
And they don't guarantee your security
Netflix will not be held liable if it gets hacked and your personal info is stolen. Also, you must agree that you will not sue them in court, or enter into a class action suit against them. Man, can't anybody trust anybody anymore?