I remember the good old days when we all thought that tech would help export democracy and free speech...
Tech itself was always a yin and yang to me.
Sites can't be traced or blocked and neither can its users. There will be free speech, along with all its excesses (terrorism, child porn, illegal content sharing etc.).
If everyone migrates towards the HORNET internet authoritarian regimes will either have the choice to block the entire internet (causing massive economic damage) or allowing free speech.
IIRC when the internet was young, there were many closed computer networks such as The Source and America Online. These tried to sandbox the internet, but people just fled to providers which would give them unfettered internet access. The same scenario will play out with HORNET.