" They have it set so you cannot change the default setting"
No, the default settings are given when your account is created and they are set at -4.
These settings, by default, remain at -4 unless you know how to change them, which most users likely are unaware of and do not.
Here is how to change the setting to a custom number.
To change the default setting, a poster must go into his or her Reddit preferences and select OPTIONS, then scroll down to the last line of the LINK OPTIONS and DELETE the -4 that is by located in the box by default.
And that is how a small group of con artists can censor what thousands of gullible lemmings are able to view without their even realizing it.