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I think by default IPFS also doesn't even replicate content. So you don't even have to block hash lookups in the whole network but just take down the one host that currently has the only replica.

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By default IPFS replicates content. That's it's main feature.

Pretty sure it used to be that you have to deliberately pin content that you want to share on your node. Else nodes that accessed it will throw it out of their cache if they don't need it anymore.

Maybe they changed the behavior in the meantime though, but IPFS didn't permanently replicate uploaded content in the past without some deliberate user action.

Yes, you have to pin to keep it, but you download it and begin serving it automatically every time you load something. You can continue serving that for a while after -- specially if you're not downloading many other things after.

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