While a world of internet users skeptically grapples with the rise of multimillion-dollar JPGs and crypto exchanges bankrolling celebrity-packed Super Bowl spots, a network of blockchain startups is trying to build friendlier consumer onramps into its vision of the crypto internet. Rainbow, a crypto startup building a mobile wallet app that allows users to interact with decentralized applications on the Ethereum blockchain, wants to be the app users download to tap into that future.