DotA ist much older now, then demigod will ever be.
And why shouldn't he copy some stuff, too? Demigod is nothing more then Dota with better grafics , less heros, less balance, less items and more bugs.
Compared to DotA, Demigod is just a nice try with a very small Community.
Why dont you just try DotA? Im am pretty sure after a few games, which are filled in seconds btw, you wont come back again...