Yes, you are correct that the USA is bigger and has more money than Canada. If you think about it globally (as one should), but it's worth noting that they're not so much moving to the USA as they are specifically the Seattle & Bay Area, and they're doing so at lower rates than for comparable Americans living outside those areas. Also worth noting, for the most part, they aren't founding companies in the US. The pattern is to go to the US, work for large tech companies, and about half return to Canada within 5-10 years, which is when they're more likely to engage in entrepreneurial pursuits.
Just looking at the financial might of Seattle & the Bay Area, it's amazing that 90% of Canada's innovators and entrepreneurs aren't in the US. It suggests that the country is perhaps more supportive of innovation than this narrative being presented.
> That and lack of venture capital/funding and, I've heard, increased government barriers compared to the USA, reduce the number of local tech companies.
The conservative financial system and comparative size of Canada does mean there is much less "free money" flowing around, though as demonstrated from the examples I provided, companies do procure foreign investment, particularly from the US, with comparative ease.
...and while you'll always here entrepreneurs complain about government barriers, having started up companies on both sides of the border, I can tell you that in many ways Canada has comparatively smaller government barriers. In particular, the universal health care and generally more significant social safety net also means that it's a lot easier for prospective entrepreneurs to leave jobs at stable businesses and take on greater risk. It's just one of many ways that while it is harder to get capital in Canada, you don't need as much to get going. This is probably part of the reason that a larger percentage of Canada's labour force (67.7%) [1] is employed by small businesses than the US (46.4%). [2]
AI hubs in Toronto & Montreal are more than just satellite offices for USA companies. You may recall that Geoffrey Hinton, "Godfather of AI", was in Toronto, teaching at U of T, when Google bought the startup he founded with Alex Krizhevsky & Ilya Sutskever... in Toronto. The modern AI revolution traces back to innovative work in... Toronto!
1. https://ised-isde.canada.ca/site/sme-research-statistics/en/...
2. https://advocacy.sba.gov/2023/03/07/frequently-asked-questio....