As someone on a Bitcoin forum once said: When has the government banning something ever led to that thing becoming cheaper?
You're right, though, that money is probably a special case, because it is designed to have limited supply (or at least sound money like Bitcoin is), and its value is related to its velocity.
The government banning something that people want to use hasn't made it cheaper, but you can't use bitcoin, you can only speculate on its trading. If the government makes it difficult to trade bitcoin (for fiat), less people will buy it, and less money going in will also result in more money going out. It'll crash the price which will further dampen its demand.
You're an idiot, you can use bitcoin for anything. Again, please educate yourself before speaking. If I use bitcoin to pay for a sadwich, do I not have that sandwich by your logic since I cannot do anything with bitcoin? What about paying for a big mac in el salvador? That doesn't exist either?
When people say something like this, what do they think? You can exchange manually, you can exchange via offshore accounts and you can simply life in a country that does not hate everything they can't regulate. For a big portion of crypto users not much would change.