From the article
"Unbending players who choose not to be extorted can resist by refusing to fully cooperate. They also give up part of their own payoff, but the extortioner loses even more," said Chen, who is now an assistant professor at the Beijing University of Posts and Telecommunications.
"Our work shows that when an extortioner is faced with an unbending player, their best response is to offer a fair split, thereby guaranteeing an equal payoff for both parties," she said. "In other words, fairness and cooperation can be cultivated and enforced by unbending players."
The same tactic is recommended when dealing with narcissists - ‘going grey’ and not offering anything. I will be adding this to my toolkit as I seek to resist ‘extortionists’ who seek more than their fair share.
Or perhaps a reciprocity between communities, where instead of everyone subscribing to c/mushroomA and c/mushroomB, the community of mushroomA would decide to reciprocate w c/mushroomB so their posts would display alongside mushroomA posts. Kind of like a keyword association that generates a multi-Reddit like co-mingling.
Edited to remove all those pings.