i'm not so optimistic regarding eth competitors) at least in 2021-2022 years. technically this blockchain is the best for easy launch dex platforms (and a lot of them are alredy operate on the market). and the most hyped defi projects are made on eth... even for me easier to check credibility and tech base of the project if it's made on eth
dex projects based on eth blockchain are really more simple and credible, as i think... besides i like projects based on curve exchange
oh so u might be interesting in new stablecoin dex - xsigma, just announced and they have interesting business model in whitepaper