An exchanger is expose to different risks. Risks often encountered include getting scammed by people who pose as legit sellers that will offer you enticing prices slightly lower than what's obtainable in the market or even same thing sold in the market.
These Scammers will privately chat you up offering you mouth watering deals and even attaching emotions to rob you of your cash or BTC.
Next they may add you to a group unknowingly to you. Convince you to use the admin as an escrow to seal the deal. Ignorantly you won't know that the admins are working with this scammers. At the end of the day they will remove you from the group after taking your cash or the coin.
As a dealer be careful, don't be after making much gain. When added to a group make sure u observe for a while before you start exchanging. This has saved me severally.
A member of group told me his own story of how he was scammed in a group we were added. If I wasn't calm to observe I would have fell a victim too