ERC 721 just an API standard for non-fungible assets. There's nothing special on inherent to Ethereum that makes Cryptokitties possible. You can totally build

ERC 721 just an API standard for non-fungible assets. There's nothing special on inherent to Ethereum that makes Cryptokitties possible. You can totally build something Cryptokitties with NEO -- the only difference is that because there isn't a standard, there isn't a third-party marketplace for these assets. (i.e., there's nothing inherent about NEO that prevents something like Cryptokitties from being built.)