There is a polish and outright joy to Threes that the clones lack. While the games are superficially similar Threes has a depth of play, complexity, and game design that reflects true craftsmanship. They took an idea and put in the hard work to make it the best they could make it. 2048 and other derivatives play like a rough draft of Threes.
As a hobbyist game designer myself I can appreciate the difference.
I'd challenge any 2048 fan to drop the $1.99 on Threes and see what they're missing.
All that said, I appreciate the awkward position Gabriele is in and appreciate his effort to address what has been going on in an open fashion. He's not the bad guy here. He has made a very good clone of an imitation of a great game.