They already are censoring certain jurisdictions, so why wouldn't they if such laws come to place? Sure the DEX isn't censored on chain it is only the website, but very few people could use a DEX like Uniswap without the website.
I'm disappointed to see so-called DEXs imposing geographical restrictions on users. Crypto is supposed to be permission-less and censorship-resistant. But limiting people of certain countries from accessing a DEX or "De-Fi" platform, would greatly defeat crypto's original purpose. Developers are afraid regulators will go after them if they allow anyone to gain access to their platform. If that's the case, why make their identities public? Now you see why Satoshi was anonymous from the beginning. Otherwise, it would've been easy to regulate and enforce the rule of law on Bitcoin.
Like I've mentioned before, "De-Fi's" future will be a dark one. It will turn into a hybrid model, combining the speed, efficiency, and compliance of centralized finance, with the security and reliability of decentralized finance. Truly-decentralized financial platforms will only get scarcer in the long run. At least, we have a choice. Better something than nothing, right?