There are several things being done with Bitcoin in Japan as part of their protest, like this https://news.bitcoin.com/cryptocurrencies-such-as-bitcoin-cash-shine-during-hong-kong-protests/ and https://news.bitcoin.com/cryptocurrencies-such-as-bitcoin-cash-shine-during-hong-kong-protests/

So basically what is happening is that the protestors are trying to use any alternative to government backed organizations and technologies to boycott their government and this is what Bitcoin is meant to be.