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I don’t see how it can be abused in a way it harms users though. Overusing it just means their post won’t be visible to many people, so abusing it just harms themselves. It would be abuse it they didn’t tag it, but that still would be an improvement compared to the current situation, and we could enforce a rule to ensure things that are political without a doubt gets tagged. (Eg: Mentioning politicians, ideas, etc)
The users and mods would decide that. Sure, mods can abuse it, but they already have the means to censor someone (ban users, tag their post as NSFW, delete their posts). I don’t expect it to be perfect, but it still would be an improvement, especially in communities that you would usually expect to be light-hearted, such as showerthoughts or mildlyinfuriating.