Most of the people say Time Series doesn't work, why?

I don't know that much about Time Series so I am not sure why most of the people say it just doesn't work for trading, so why they think so?
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TOP of the fake list='' predicting with time series'' LOL
But since many SEPTembers look alike, but not exactly\ alike, some like it...........
NOT a prediction +not insured by any federal agency.
 
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