After two years, six months, and 22 days, I am going to stop sending emails to Canadian professors. During these two and a half years looking for a Ph.D.studentship. The majority of my friends said that university professors are bombarded by emails from all the countries across the globe. I said ok. During this period I have published many articles in some reputable journals. Unlike Canadians, the Americans, New Zealanders, and Australians are the best ones, always reply to your email, say "yes" or "no". If Canadian professors are busy, please set your automatic answering in your email setting to reply NO. Thanks.
It seems as though you might be the issue here, not the professors. I say this because the odds that every single professor you’ve emailed from a Canadian institution not responding because of their geographical context is near zero. Particularly because those at Canadian institutions are not necessarily even born Canadian‘s themselves, so you’d have to argue that Canadian academic culture is the problem, which again, I can’t envision being the case.
You should do some serious reflection on what your email titles are, your body paragraphs, how you come across, and the Canadian system will help you to find a more rational answer.
I suspect that Canadian academics get a far larger number of queries from prospective Iranian students (I gather from poking around in your question history that that's your country of origin), certainly compared to the US in recent times, because Canada is more open to student admissions from Iran. Therefore, Canadian academics may be increasingly overwhelmed by inquiries, and your inquiries may be more likely to be lost in the flood.
From here, "The number of Iranian student applications [to Canada] has more than doubled since 2017." (presumably the number of inquiries is roughly proportional to the number of applications ...)
(I am a Canadian academic who doesn't always manage to send a polite and timely e-mail response to student requests, even domestic ones! I get large numbers of inquiries from the Middle East and South Asia ...)