I am not sure which scam you indicate. Is it on the forum or outside the forum?

On Forum: The forum doesn't moderate scams. There is a saying, Do not trust, Verify.
Do trust anyone in this forum who doesn't have a reputation. Check their trust feedback page. Still, If you want to make any deal with forum members, Use an escrow service. If they do not agree to use Escrow service, you can assume they are potential Scammer.

Now, Let's talk about outside forum scams.
This also belongs to the forum as well. If you see some attractive offer, Do not fall for it. Do research.
If you see someone Selling a Miner for $2000, but the current market price is over $3000. This is maybe a potential scam attempt. Do not trust Ponzi schemes. Every Ponzi schemes are scam. Do not trust Cloud Minings. Do not trust Bitcoin or whatever doubler website.
Do not pay upfront. Not sure what else I can say. That's all I have in my mind.