By CCN: CryptoKitties, a smart contract-fueled decentralized app (dApp) built on the Ethereum blockchain, was supposed to be the one to jumpstart mainstream adoption of crypto. You know, kind of like the Mario Bros of crypto, but instead of Luigi and Mario, there are digital cats. After all, it was the app to clog the Ethereum blockchain, causing a bottleneck from the game’s popularity that slowed transactions to a snail’s pace. Nonetheless, the crypto ecosystem is still waiting for that one ‘killer app’ now that CryptoKitties and other promising dApps failed to gain scale.