Actually, I'm not entirely sure on how archive.org achieves its resiliency.
It's a rather interesting question for archive.org, if one were to interview them, that is.
Unlike archive.today, they don't appear to have any issues with e.g. child pornography content, despite certainly hosting a hundred times more material.
They have some strong magic which makes the cheap tricks needless.
e.g. currently most media snapshots contain wartime propaganda forbidden at least somewhere.
RT content verboten in Germany, DW content verboten in Russia, not to mention another dozen of hot spots.
"Other websites" are completely inaccessible in certain regions. The Archive has stuff from all of them, so there’s basically no place on Earth where it could work without tricks like the EDNS one.