Governments can ban crypto related websites, that's what is possible in their power. Inserting data in the block chain is easy but then I dotn think that they can do anything against because it's encrypted version is so very hard to crack and I think hackers have been struggling hard to manipulate the data but since they haven't been able to yet, they instead are hacking the websites and getting their things done which is more easier to do.
This is true. Hacking an exchange is clearly way easier than going after the blockchain itself which is way more sophisticated and complicated to crack. Many have tried and failed. I doubt anyone will be able to hack the blockchain.