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Semantics aside, one interesting claim the paper makes is that if the researchers' approach were adopted, the Bitcoin network would be split into miners who could choose to abide by the boycott recommendations -- or not. Initially, those who did follow the rules would make fewer profits, but if their group grew to 35% of the network then they would start negatively impacting the profits of the other miners who ignored regulatory advice.
Probably a variant of selfish mining.
Edit: It is indirectly: blocks with the [color-listed] transactions would be ignored by the participants. They came up with a way to do distributed selfish mining.
