If your personal account is frozen you could still work for someone else and ask them to pay you cash. Yes, reduces you options, but you still have options.
Ergo you can still make a living.
And if cash is a valid form a payment you can pay your mortgage with it.
Ask Trudeau why he did it like that. Most probably he didn't have a basis to arrest them, maybe he was afraid of fights breaking out or maybe it was a sign that "we can destroy your life anytime we want if you don't obey".
Either way we saw a lot of similar stuff here during Covid where the politicians simply ignored the most basic of laws "for the greater good".
Ergo you can still make a living.
And if cash is a valid form a payment you can pay your mortgage with it.
See how simple it all is?