> I might be asking about laundering money to commit a crime, or to prevent one.

Or, much more likely, the same pattern of tokens happen to exist in a completely different discussion, either as a direct metaphor, or as a reality of linguistics. Hell, "laundering" itself is a metaphorical word.

The absurd notion is that any speech should be policed in the first place. If there really is such a thing as dangerous information, then it must be removed from the training data. Any other strategy simply launders the risk.