There is always a risk in any service. Don't believe anyone who thinks that decentralized exchanges are safe, it's a deception. In centralized exchanges there is a risk of hot wallets being hacked and clients' money being withheld because of the centralized nature of the service itself. There are risks in decentralized services too and they are related to vulnerabilities in smart contracts, as well as various phishing attacks related to connecting your wallet and granting it rights. These are often used by hackers when you connect to a decentralized application and click approve in your wallet. There are risks everywhere, and very often these risks arise from the user's inattention.