People are I hope aware of the ability of abuse reporting systems to themselves become channels of abuse. Facebook's real names policy is exploited by anti-trans campaigners to force people off the platform, for example. Anyone should be aware of the risks of automated threshold systems being abused: if all you have to do is get 100 accounts to press "report abuse", that will be abused very quickly.
Local standards also present problems. Do we really want to go along with e.g. Pakistan arresting people for blasphemy?
It's definitely true that anti-abuse systems can be themselves abused, though most of the systems that you're talking about are partly due to the anti-abuse systems being centralized, right? I also see a lot of comments here along the lines of "but that's censorship!" But the article is discussing decentralized anti-abuse systems which allow individuals to set up their own opt-in filters which apply to themselves and their communities (which means different people might have different filters). Do you think that's different?