worse it's damaging Bitcoin itself and the P&D / cloning crap is a big reason why BTC went from $1100 usd to $200
and even worse the flow of new people dried up.. they end up seeing the Altcoin clown show and walking away.
Altcoins = pissing in the wind
they are ruining a good thing and taking Bitcoin down with it in the process.
On topic I have seen the recycled IP's a lot last couple years doing this..
Same with domain names or IRC login nodes etc.. Github account names.
There is guys doing a lot of cloning and people don't see it so they don't grasp how bad it is.
invest wisely