Ethereum claims to be the "World Computer" that lets you build "Unstoppable Applications". If that doesn't sound like an AWS competitor then I don't know.
To put it another way, the problems that Ethereum will solve are not ones that could be solved by AWS.
Despite both being energy/transport companies, Embraer and Tesla are solving two very different consumer problems.
I think Ethereum is going big places, but the AWS ledger solution is probably also going to be good for smaller industries where competitors don't trust each other, they want a database that's shared, and they all might trust Amazon enough to control it (eg if they're all using AWS anyway)
This has been possible since the 80’s due to public key encryption.
It’s not having to trust a central actor that’s the innovation behind e.g. Bitcoin.
You could make an argument it’s a competitor to AWS Lambda, but it would be akin to saying lxc is a serverless competitor.
Everybody can see the code/transactions that are run for free. Everybody can have their code run and execute transactions for a price.
There are quite probably innovative new things that can be built using Etherium's "world computer", but my guess is that almost _none_ of what's currently running on (and paying for) AWS resources will move to it.
Those are multi billion dollar business with billion dollar requirements in infrastructure investment on a yearly basis. Not going to happen.
There's not a lot to go in in those two words, but claiming they mean Etherium is out to capture all (or any) of AWS's customers is a _very_ long stretch.