Even if coin is a scam, still can be traded.
Of course -- trading it is THE WHOLE POINT and that's why it's on so many exchanges.
But I can't win against the scammer who created the coin and holds all the cards.
So trading is always one way : that's why we see everybody losing 70%, 80%, 90% of their investment trading here.
Not strictly true since it is possible to profit on the coat tails of a scammer, indeed this is where most profit is likely to be made.