that's because corporations get taxed on profit, and individuals get taxed on income. profits can be rerouted to more tax-favorable jurisdictions, but it's much harder to pull off with personal income.
>It's a terrible deal for Canadians who will be paying US taxes without living in the US. Will they be eligible for US social programs, etc.? Why should the first 15% (IIRC) of income taxes from YouTubers go to the US? That's BS.
In the case of canada (and other countries with a tax treaty with the US), this is a non-issue because you either pay 0% withholding or can deduct the tax from your country's tax return (presumably the tax treaty also contains provisions for your country to net out the difference with the US).