That’s useful for “real life” data, so to speak, stuff that should be immutable, save for a few occasions, like correcting errors; but my question was geared towards internet content. Taking your example of Wikipedia, if the service suffers from a wave of trolls, as it exists today, it can roll back the changes. With a blockchain? That’s significantly harder, especially if useful edits happened in the meantime.
There’s also this problem:
you don’t have to store the data itself on the chain, the chain data can just “point to” off-chain data which you can take down or modify at will.
Supposing this Wiki doesn’t store any of the content, then the endpoints become the targets, which beats the whole purpose of the blockchain resilience/immutability. An endpoint that can’t be reached is useless, one that has been compromised is even worse. You can trust the blockchain, but not the endpoint. And if the endpoint is where the “real stuff” is at anyway, why even bother with a blockchain?