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The protest is super unpopular in canada. It could just as easily be a random canadian citizen who is pissed about the protest and wants to prove that the protest is not grass roots but foreign meddling.
That said, I agree this is most likely the work of an individual. For all its usefulness in raising money, GSG has probably never been subjected to a real-world pentest by a highly motivated attacker. Not to mention the legions of attackers one would expect from such a polarising subject. This was unfortunate but entirely predictable.