They are identical in the same way that my Hacker News and Facebook are identical. They are both places where people post stuff and comment on stuff but the community in each is very different.

If Hacker News were to shut down for just the US users and people were told to go continue the conversation on Facebook do you think that it would feel the same?

Part of what makes TikTok and Hacker News great is the interaction with people all over the world. What's going to happen to the diaspora? Are they going to all end up in one place?

Again, if Hacker News kicked out all of the Americans living on US soil then would the rest of the users follow the Americans onto Facebook to continue the conversation?