Actually, Linux does mean 100% open. Anything that is in Linux is open. You can attach non-open to it, you can run non-open in it but Linux is 100% open and that IS the whole point. Distributions based on Linux, not-so-much. Go read the GPL license that comes with it. Go on.
But this is NOT the same as registering for my bank, because my bank didn't kidnap me in my sleep to steal my information without me even realising it.