The flagging system wouldn't cause any action to be taken, it would just alert a human admin about certain words and phrases. The admin then uses their judgement to decide whether any action needs to be taken.
There isn't anything automated here except telling the human admin there *might* be a problem.
For example if someone is using words or phrases that are usually used as slurs, they would be flagged up and the admin would look at the context to see if it's abusive.

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