Most anarchist attempts had armies, built around anarchist principles : self-discipline, electing officers, more equal pays, etc. Some argue that this is state-like, i'd say it depends on what happens when the war is over. And i prefer an army where soldiers are inclined to criticize and change their officers, it's more likely to disband.

You've also invented immune-systems, which fight pathogens & parasites, within our bodies..

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Widespread nuke technology - the great equalizer.

Joking of course, we’d annihilate ourselves immediately.

I think humanity would need a very different set of priorities to make anarchy work. We’d need to value human life for starters. Maybe after experiencing collective ego death following a worldwide calamity or something.

2 minutes in, the biggest gang in the area would already have declared themselves the ruler, ending anarchy. But yes.