Hmm. Putting 1 gigabyte in S3 for 500 years at today's most expensive price ($0.023 per gigabyte month) would be $138. Prices are certain to decrease over time. This says something about the cost of using the Ethereum blockchain for storage.
And who knows what the unexpected looks like...Wars, political shifts, etc. Hell, until 2019, I thought toilet paper was unlimited. Once again, toilet paper is starting to look like the currency of the new-world.
:) That's a joke BTW. But is it? I don't want to go back to using squirrels as toilet paper!
Blockchain being for small quantities of data made immutable, used in a p2p manner with as many copies as there are peers.
S3 generally being purpose built for short term (relative to blockchain) storage and price.
That makes the value proposition of the Ethereum blockchain as a data store a lot less attractive.