Somebody needs to explain to me how a government could successfully shut down Bitcoin because I'm incredibly confused when people suggest this. You can't stop

Somebody needs to explain to me how a government could successfully shut down Bitcoin because I'm incredibly confused when people suggest this. You can't stop people from meeting in person and trading things amongst themselves with cash. Banning cryptocurrency would require the same effort that would be needed to ban drugs and last time I checked the illegal drug market is huge even in countries where there's legal access. How will cryptocurrency be any easier to ban?