Censorship still requires a nuclear option, no matter who pushes the button.
So could Steemit be destroyed if someone posted a bunch of "illegal content" on there? If so, that's a HUGE flaw in a business plan considering the current state of The State.
This is little different from any other blockchain. There are links to CP and probably some other bad stuff mined into Bitcoin's blockchain.
Links are perhaps the least problematic since there is always someone else you can go to to try to get the data taken down.
It is very hard to prevent people from storing data on a blockchain. Even if you just store hashes, transactions, signatures, etc. all can be used/abused/misused (take your pick) to store data.
Technically incorrect in the case of asymmetric public-key cryptography signatures.
Afaik it is mathematically intractable to find a public key that enables you to produce a signature that maps to some chosen data.
So then we don't store the hash of what was signed. The data provider provides the match. So the blockchain doesn't store it.
Also there may be some way to detect if a hash is not randomized data.
I didn't say the signature has to match, but it can still encode data.
The validators will not accept invalid signatures. Thus no way you can store any data you want on the blockchain. What is being signed wouldn't be stored on the blockchain. Please don't pretend you don't understand.
The sender can change the data slightly which produces a different signature. This can be used to encode whatever data you want. If the data is encrypted or otherwise obfuscated then it is between difficult and mathematically impossible to distinguish it from random.