Sorry, this has nothing to do with Steem.
... Government authorities and Banking institutions. Do you consider these people are likely to just let Bitcoin exist with out their involvement or blessing? Do you think these folks aren't going to wish to have manage and choice to adjust Bitcoin as they have fiat?I think the answer is No!
You must be new here,
The whole point of Bitcoin is for these people not to be able to stop it. Maybe that document (which I haven't read) will help you come up with some relevant vector of attack.
Bitcoin Security Threat Model (PDF)
https://gateway.ipfs.io/ipfs/QmSJm9XGHXyxRaMFfLN2scunbMyopCU7xPxz3WQHLfLKQy/#/