I think of web3 in a different way than I see it commonly talked about. I think the idea behind the changes in the Internet that people identified as "Web 2.0" was that the Internet was opening up to more people with the creation of sites that allowed user participation. It was a recognition that although the early public Internet allowed anyone to participate, in reality the cost, effort, and know-how involved in setting up a website was a hurdle most people couldn't overcome. So with Web 2.0 the internet was opening up to more people. We now know that this led to a perverse centralization of power. Yes, more people could now participate, but mostly on a few corporate-controlled platforms.

Web 3.0 is supposed to be a continuation of the trend of making the Internet "of the people". Web 1.0 was open to anyone. Web 2.0 was more open. Web 3.0 will be even more open. (In theory.) Web 3.0 isn't about Reddit or the other sites this person mentions. It's about all the new technologies people are coming up with to enable participation on the Internet free from the control of a few centralized corporate platforms. Blockchain is a big part of that, and cryptocurrencies. But so is tildeverse and Mastodon and Gemini and all that stuff.

Also, it's not the case that ARPANET was designed to stay up "if the Soviets took down important cities or strategic datacenters". Bob Taylor, the man who literally made the decision to authorize and fund the ARPANET, has said so himself. "The creation of the ARPAnet was not motivated by considerations of war."