Is dex legal in the USA?

I understand that decentralized exchanges, also known as DEXs, are becoming increasingly popular in the world of cryptocurrency. However, I'm curious about their legal status in the United States. Are DEXs legal to use in the USA, or do they fall into a gray area of the law? I'd appreciate any insights you may have on the regulatory landscape surrounding DEXs in the United States, as well as any potential risks or considerations I should be aware of before using one.