Governments can't control it in a sense that they can't create more of it and can't sensor transactions(sanctions) .
If you think of it as the same idea of gold, the government can't make more it. They can limit transactions to a degree, but they can't really stop one person from handing another person a suitcase full of gold. They can make laws around it, but they will not necessarily be enforced. There is of course oversight over gold, but the government doesn't have as much control as fiat. Namely they can't make an infinite amount just by passing a bill.
The government can make as many laws as they want, whether they are enforced or not is another matter.
Governments can control it. In the end of the day, sure they can't control that gold, but moving gold itself is a problem. You can't go to a dealership to buy something with your gold suitcase. In order to do anything useful with that stored wealth you need to convert it to cash and that's where they get you. That's how they control it.
If you think of it as the same idea of gold, the government can't make more it. They can limit transactions to a degree, but they can't really stop one person from handing another person a suitcase full of gold. They can make laws around it, but they will not necessarily be enforced. There is of course oversight over gold, but the government doesn't have as much control as fiat. Namely they can't make an infinite amount just by passing a bill.
The government can make as many laws as they want, whether they are enforced or not is another matter.