(As for why the investors have to be from an approved list? Probably to avoid sham "angel investors" fake-funding their acquaintances, or outright selling visas.)
This is a valid concern, though I'm worried it will swing the pendulum in the other direction also - that it basically gives non-regulated, non-governmental, non-accountable entities the ability to wield immigration as a stick.
That or allow an existing cabal of VCs to lock out competing, upstart VCs.
My suspicion[1] is that the thing that will really fix this is changing the way that investors are taxed on their capital gains and losses.
[1] Been a while since I lived in Canada, but IIRC capital gains and losses are not taxed like they are in the US.
True, but that is an exemption that gets used up. There is a $750,000 lifetime capital gains exemption. Which most people don't hit, but a successful founder could.