Oshosondy what do you mean by decentralized exchange staking? I don't know about other wallets but binance exchange owns trust wallet and that staking on their app moves your assets into another wallet for staking, that's not decentralized to me, it's complete centralised staking
The best decentralized exchanges existing are the ones that support bitcoin, if you check the exchanges that you can stake, you will notice that bitcoin is not supported, they are ethereum, binance and other coin exchanges that support their tokens. That is why the real decentralized exchanges that are still existing are bisq, hodl hodl and others similar ones. Those staking exchanges are just no kyc exchanges but they are not decentralized like people think.