I don't know how will it play out for Signal in countries which have banned or are planning to ban crypto as a currency. RBI had issued policy to banks to stop providing banking services to people/organizations holding/trading in crypto. Though the blanket ban was invalidated by the supreme court after two years, but using it as currency is against Indian Law and the government is working on a new law to further restrict it (read legalizing RBI policy to a great extent as I understood) .

In such cases, Signal could easily be banned in such countries outright.