For those wondering, their website is: https://www.cryptopets.co
It depends in which way is it the king of altcoins? Ethereum is a great platform all smart contracts have fee in ethereum and miners earn their cut wow why not, whats up with people that are keeping the nodes alive? huh no crypto coin is perfect neither is ethereum. Even ethereum will need to scale if there are more smart contracts like cryptoKitties , because network could be loaded in theory if to many smart contracts are running across the network.
Idea like idea is funny but hey every one of these is unique thats why we could see more projects like this rising up.