He did an interview with Forbes and clearly stated that he was not being sued. If he was, we know about it since I'm sure the thousands of other clones would be sued and the company suing them would want some publicity.
I never said he was currently being sued. Also many of the clones probably don't make the money the original does.
I personally believe he's probably some poor indie developer who's practically won the lottery and realizes he could loose it all by all the attention he's received. Removing the app, and disappearing until everything settles down, (whilst still making residual revenue from all the current installs), is the best way for him to mitigate his growing risk of being sued, which is probably scary for him and out of his depth, being a solo indie developer from Vietnam.
Of course he could just be a crazy irrational indie developer as the article assumes, among a number of other explanations which we will probably never know the truth :)
http://www.forbes.com/sites/lananhnguyen/2014/02/11/exclusiv...