When I read the word Leftist that means they are against the government or to be specific certain rules of the government. And banks are regulated by the government, so it's possible that the order is coming from the government to put some pressure on them, if they have not violated any rules particularly anti money laundering.
That's the reason why Bitcoin was born, self-custody is always the better solution when it comes to controlling our own money, as banks can be corrupt and can be used for political persecution if what happened could qualify as that.
How exactly does the word "leftist" equals being against the government? With this viewpoint, you'll probably categorize the right-wing as patriotic, wholly supports the government and all its authoritarian activities. Quite absurd if you ask me.
You're right on the notion that as banks are regulated by the government, then it's not surprising that this is perceived as an intervention by the government.
Whatever the case may be, this is yet another story of cryptocurrency again coming to the rescue and saving the day. Having been closed off from their banking accounts, they're now relying on donations(crypto included)to help them stay afloat. I clicked on the donations page and saw they've got an option to donate in crypto. Although they noted donations in crypto wouldn't stay anonymous due to legal/tax reasons.