These automated exchanges seem to be growing rapidly. At one point last year Uniswap had 77% of Coinbase's trading volume: https://tokenist.com/with-33x-fewer-employees-uniswap-has-77...
Perhaps, but I'm not sure if that answers my question.
Cryptocurrency networks are decentralized on their own, but I'd say the way we generally interact with them is not. It sounds like we agree on this point.
However, whether a decentralized system is accessed through a centralized layer or vice verse, the result is a service that is not fully decentralized. If any entity, such as a bank, third-party banking service provider, cryptocurrency exchange, etc., is involved at any point, that entity effectively has some control over what happens on the associated decentralized system. This results in an at least _partially_ centralized system.
I imagine it won't be long before Coinbase, for example, will warn you against transferring to wallets which aren't held by one of the big providers.