If he's getting 1000s of unique visitors per day, then I can understand his desire to cry fowl, if he's getting more like 10 per day, then he has nothing to complain about. There really is no larger issue here, only someone yelling "First!".
If I have 800 daily unique users of something I put real work into, and someone launches a very similar product with the same name then I have every right to ask them to consider a name change.
The OP needs to start off with an apology because in the very least he did not Google his own name and concept before launching. That's awkwardly gauche in my books.
