I just read all the drama on Tumblr and Twitter about this subject. My thoughts are this: (not that anyone cares, but something to think about)
First, The sims team members from twitter (including the debatable "real or fake" message convo) should not be giving any LEGAL advice. It's just "their thoughts and opinion" One of them even stated it was "their thoughts". ONLY the LEGAL Dept of Sims should address such questions and Speak for sims. Those Sims employees are not from that department therefore have no right to say what Sims Legal process/guidelines would be exactly.
Second, Once you log into sims you click to agree to the terms of the agreement. This clearly states in small print, anything created for Sims from outside Sims can be taken, modified, used Ect... by EA. You are agreeing to give all control of/ rights to anything produced to the EA. So, in fact, the statement is that it's the "Creator content" and they have "total rights" to it, which is not actually correct. They are what is called "fanart" you have to use sims in order for it to work. It has no use outside of Sims. This falls under "fanart" and you forfeit rights (once you click on terms of the agreement to play sims).
Third, EA's LEGAL Department has precedence over this subject Since Sims is apart of EA. NONE of these "Creators" are asking or pursuing information from the actual Legal departments of EA or Sims.
If they did, they would realize all their " I own the rights" would be debunked and they could no longer deceive themselves into believing what they are doing is 100 percent ok.