Once they started playing content cop, they lost that defense.
As for Texxxan, if their business model was encouraging users to upload pictures of people in compromising positions without their consent and then charging for the takedown, it's just a shame the charges against them aren't criminal.
A valid DMCA take-down notice, may only be made by a rights holder.
http://www.legalmatch.com/law-library/article/controlling-th...
There you go. Also as another commenter you need model release forms. You are the rights holder of any likenesses of yourself.
In Texas, they might have more standing against GoDaddy than Texxxan.
Adult websites however are bound by federal law (18 USC 2257) requiring signed releases by all "models". Websites like Texxxan.com are in obvious violation of this, and bordering on organized crime.
The problem is suing both may cause the entire thing to be dismissed. (IANAL)
For example, if this requirement were enforceable against user-posted content, online adult personals wouldn't be legal. A little quick Googling finds me the Stranger's adult personals disclaimer: http://thestranger.selectalternatives.com/gyrobase/adult. According to 18 USC section 2257, you aren't considered a producer if you are limited to things like photo or film processing, digitization, distribution, an ISP, etc. (http://www.law.cornell.edu/uscode/text/18/2257). Similarly, IANAL, but it seems that adult sites have a certain amount of protection for user-posted content similar to YouTube's copyright safe harbor.
See also: Texas patent troll lawsuits