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.
One learns something new everyday, honestly.
I did not know that was possible. I assumed one needed to use the Uniswap interface as a the only way to interact with their smarth contracts, but now you mention it, it makes sense someone with enough knowledge on Ethereum code language could send a transaction directly to those smarth contracts and using the appropiate code in order for them to swap whatever coins they desire to.
Though, if Uniswap gets too rough with restrictions to some regions or wallets, what stops other developers to distribute tools to avoid those restrictions?