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And that is where you got it precisely right - I can ignore domains, I can ignore tags, and I can ignore users. That gives me three different chances to keep out the spam. Of which there's quite a lot, actually - a perusal of the zero-dots field illustrates that there's plenty. But it doesn't get shared around, so it might as well not exist. Reddit does not have this ability, and that is why moderating is warfare.The need for a ‘Not Mine’ policy is a matter of design. When users have the tools to avoid unwanted content, open submission of personal content actually decreases the need for global moderation and anti-spamming mechanisms.