The difference is they can't enforce this.
Discussion
it can enforced by prohibiting spending within jurisdiction legally - learn from Argentina Nigeria
They can't stop a peer to peer transactions. We are not loyal to our states. We are rebel Bitcoiners.
only 1% bitcoiners use P2P 90% is either in ETF / MSTR / under institution control
LoL we will always 99ers they will 1% who will hodl bulk of it
Gold chunks are pretty private if you ask me. And somehow they were able to enforce the rules on gold.
My guess is that nothing stopes governments from dong the same for Bitcoin.
It's not like they know how much coin you have, its more of making you a criminal for using "self hosted wallet". Some people will voluntarily comply not to be left in the "illegal" market.