This is the worst kind of misrepresentation of tech. Nothing you said is explicitly false, it sounds true in passing, but it sure is effectively false.

The amount of data you can actually store in any single node/transaction on a given blockchain is traditionally very small. Even most NFTs are not truly "on the chain" as in the image data fully stored in a node/element, it's instead a "smart contract" which just says X identity owns Y (with Y itself being stored elsewhere). There have been many many attempts at actually storing data on various chains and there hasn't been any successes significant enough to come even close to being able to store the classic 90's Space Jam website, let alone the fucking Internet Archive.

Beyond that, you absolutely can take down nodes in a chain, so to speak. Numerous major "heists" have been "rolled back" or had their nodes/transactions flagged to be ignored by marketplace admins.