If you give the government the power to block financing to anyone they declare a terrorist then they'll just declare anyone who opposes them to be terrorists.

Empirical evidence suggests otherwise, at least in liberal democracies.

survirorship bias

Empirical evidence can suggest anything you want it to if you choose to ignore empirical evidence that's inconvenient to you.

The Canadian trucker protesters were not "terrorists" by any stretch of imagination, but sure let's assume otherwise because it helps us sleep better at night, right?

Pretty sure building a bomb on Parliament Hill makes you a terrorist group. Nevermind all the other dangerous stuff that was going on.