> From the above, it is clear that our primary obstacles are not technological [5]; hence Tim Berners-Lee’s call [6] to "assemble the brightest minds from business, technology, government, civil society, the arts, and academia to tackle the threats to the Web’s future". Yet at the same time, computer scientists and engineers need to deliver the technological burden of proof that decentralized personal data networks can scale globally and that they can provide people with an experience similar to that of centralized platforms.

This whole article looks like "well, the obstacles are not technological, but let me write a few pages about technology anyways".

If the obstacle are not technological, then we need non-technological solutions. So far I think GDPR is one such non-technological step towards taking back control of our personal data.

The hardest problem in my opinion is "preventing the spread of misinformation" because we essentially need a way to distinguish between malice and stupidity. Without mind-reading I do not see how this could be possible at scale.