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Atomic swaps were possible way before Uniswap and the DeFi craze. Liquidity is another issue for 7.5bn though.

Isn't Uniswap doing a swap within the same chain?

Indeed. Alts should be wrapped so that they become swap-able with Uniswap. In that sense, Atomic swaps are superior since you have zero counter-party risk. Who guessed Bitcoin tech is superior to that of Ethereum?

Correct me if I'm wrong, but doesn't wrapping require KYC? So how could this be used to convert the BTC to Monero?

Wrapping and KYC are orthogonal, although maybe most of the current implementations require KYC, no idea.

Cross chain atomic swaps are something else entirely. Typically they involve using timelocked multisig transactions that reveal a new part of a secret in each output, allowing both parties to redeem or both deposits to be refunded.

Afaik, it's the custodian who requires KYC. The trading happens without. This might become a problem for custodians who now have a bunch of illegal coins. It'll be interesting to see how this will unfold.

https://bisq.network/markets/?currency=xmr_btc

https://comit.network/

https://github.com/comit-network/xmr-btc-swap