A piece of technology that seems to be missing is a global decentralised anonymous identity and trust framework. It probably requires a leap of engineering comparable to the invention of the blockchain (although I don't think that a blockchain is necessarily the model to follow here, since the data should be encrypted).
Every website and app and network service seems to be reinventing the wheel here, and end up creating little silos of trust data, whereas in principle it should be possible to receive a (locally) consistent answer to the question of "Is this person in good standing with the other humans they interact with?" whether that person is sending you an email, or writing a software library you are downloading, or creating an account on your website, or selling you goods on Ebay, or offering you a lift through a ride sharing app.
Every website and app and network service seems to be reinventing the wheel here, and end up creating little silos of trust data, whereas in principle it should be possible to receive a (locally) consistent answer to the question of "Is this person in good standing with the other humans they interact with?" whether that person is sending you an email, or writing a software library you are downloading, or creating an account on your website, or selling you goods on Ebay, or offering you a lift through a ride sharing app.