This time the answer is "It's useful to make your mortgage payment when one of your family members donates to a trucker protest that successfully applies pressure to the Canadian government, which then 'freezes' your bank account until the emergency legislation expires."
The quoted tweets point out that legal pornographers and legal gun shops have been subjected to similar, but less transparent, measures.
Of course the law says it applies equally to cryptocurrencies, but it really only applies to intermediaries. The point of cryptocurrencies is that they make you independent of intermediaries; you can possess your own coins instead of lending them to a bank or a stockbroker. This is part of what the Nunchuk response quoted explains.
Previously: https://news.ycombinator.com/item?id=30408611