stablecoins except DAI can be frozen even if they are in your wallet.
A user account on a platform is different from a deposit address in a wallet. I meant the possibility of freezing coins if you withdraw them to your wallet, which is what happened several times after bridges or CEXs were hacked.
Inside the platform, you do not own your coins, but the money is controlled by the platform.
Yes, DAI cannot be frozen by the wallet or inside your wallet because it is decentralized. There is a group of auditors and you can contribute to the decentralization of the network if you have a lot of money and buy MakerDAO. The only problem is that its price may not always be equal to one dollar, which is a problem with all stablecoins.