Did you see the huge queues at ticket machines? Protesters were buying with cash because they didn't want ticket purchase history to be tracked and to link them to being at the protests.
https://www.coindesk.com/crypto-is-an-important-defense-against-todays-orwellian-surveillance
So if thats the case, maybe bitcoin as a legal currency will debut on Hong Kong unofficially. If you really dont want to get tracked, use cash or cryptocurrency. Im sure people there are aware of crypto now because they need it in this situation but it will be a bad image if crypto starts in a crisis.