Canada doesn't have a direct, systematic way of blocking these transactions in the same way how other western countries are building up their systems. Your example was only made possible after the invocation of the Emergencies Act, which was shortly repealed. Whether using the EA was justified is still hotly debated, but most Ottawans living there at the time would agree that it was. This wasn't just a "wrong political protest", like the government punished people for having the wrong political opinion. Right-wing and far-right protests happen all the time in a political place like Ottawa. The issue here was the scale and the intensity - it was less a defined protest event and more of an attempt to settle in Ottawa for an indeterminate amount of time, complete with harassing locals while demanding accommodation to not freeze in the winter nights. I wouldn't be surprised if those "peaceful protestors" gave a lot of the downtown residents hearing or lung damage. The restrictions that came into effect then seem more like the exception than the rule, the government isn't by default authorized to do whatever. Even in something that had so little support, the pushback against the government's response was considerable. So I wouldn't portray any of it as something systemic or easy to do, like what some other nations are building up in their push towards authoritarianism.

I agree that in general the world is moving towards more authoritarianism and control in all facets, but I think Canada is still solidly lagging behind their friends in the UK, US, Australia and some EU countries. We still have no internet censorship authority. There is still hope to push back internet regulation a bit, even though it's obvious it won't last forever. The bills to clamp down will just be reintroduced over and over again until one of them passes. Still, banking bans are unlikely to come anytime soon, unless the people decide to threaten a whole city and the national government by putting on another J6 reenactment.