US is trying to ban Bitcoin, not only the centralized exchange!

Although decentralized exchange can be a way for the US citizens to trade Bitcoin, you're breaking the laws and you're must make sure anything you're doing will not get detected by SEC! when you're using decentralized exchange, you will need to use bank accounts to receive your fiat which is leave a trace for the chainalysis and SEC to track you.

I have no idea why you can think using a decentralized exchange will offer 100% anonymity, it doesn't simple as that.