So many this kind of swap dex already exist in the market. That's wrong rumour and where do you get this rumour? You will never able to avoid ethereum gas fees as it's permanent based on the calculation in the network. If you wanna avoid the high fees in ethereum blockchain and just use another blockchain. I can't agree with you on this because that's non sense. You can pay cheap fees once the gas fees is going down but there's no ETA for this to happen. This totally depend with the network itself. The dex will not make the transaction fees to be reduced a lot since dex is just a place to trade.