Bitcoins operate off central Banks meaning the government can not control its supply or influence its value like they do with fiat currencies. This threatens their ability to manage national income. Also since Bitcoin can be pseudonymous, the government worries that people may use it to evade taxes, launder money,Or finance illegal activities.
This is nothing new. Everyone already knew about this, there is no central server for Bitcoin and no one can mint more Bitcoin from what it has for its supply limit. And there is a specific time until the last Bitcoin will be mined, meaning, no manipulation and no more minting that can be done by those projects to their altcoins.
Why are some embracing it while others seek to regulate or restrict Bitcoin??
People don't want anymore to be entangled with the centralization that they have been in the society which is done by the government. But look, government is joining the revolution as well because they cannot defeat Bitcoin. They are actually still on it trying to do what's necessary as a function of government.