I have withdrawn and trade ETH from MEXC multiple times already and I am never charged more than $3 but when I swap ETH ERC 20 on Uniswap the gas fee is almost always $10 and few times over $10, why is it like this? Are DEXs suppose to be more costly normal centralized exchanges?
As people already explained, there is significant differences on how CEX and DEX works. Most of the trades in centralized exchanges are just adjustment on balance sheets and no real transaction occurs. But when you are doing a exchange in Decentralized exchange it could go through one or multiple transactions. And I agree that Ethereum network is about unusable, when it comes to DEX, I prefer to use BSC, many exchange even allow ETH (BEP token) withdrawal to BSC wallets.