Dex fee are stupidly expensive, due to ethereum gas fee and the current popularity of decentralized finance as the fees spike over 500% in one month, for now it's not recommended for day trading or for trader just in general. The good think is Ethereum 2.0 getting closer and closer as it will reduce the gas fees and hopefully in the future the Ethereum technology will keep improving and maybe Dex can even be a first choice for trader.