I see where the Threes! devs are coming from because, well, a lot of people called their game a 2048 clone, and I'm sure it sucks to see people playing a similar game instead of buying yours.
I also see where Gabriele comes from. The guy just wanted to make a game! He wasn't trying to steal anything from anyone, he made a lot of people very happy and he has nothing to be ashamed of, or worried about.
To be honest, I think if you take the intersection of 2048 players and people who would pay $2.99 for Threes!, you'd end up with a pretty small group.
I think everybody won here.