A) French speaking Quebecers are poor, relative to N. America. Median wages are 'ok' due to lots of 'decent' government jobs, but mean wages for Francophones are very low.
B) Francophone business networks usually don't expand beyond Quebec. There are no elite Universities in Quebec (McGill is pretty good, but not French), and there is zero access to networks from elite schools among Francophones.
C) There are very few wealthy Francophone Quebecers who 'write cheques' for startups.
Ergo - networks are very weak here, it's just a fact.
I've lived in several cities in N.America/Europe, this is by far the weakest of 'known cities'. It's probably better than Orlando. Or Dublin. But worse than any of Boston, Toronto, Vancouver, Frankfurt, etc..
"The "career" of an artist, as you mention, is not something for you to judge the quality or success of. "
I'll judge these people however I want, but it's not a judgement to point out that people who prefer to serve coffee and write 1 short play every 10 years aren't the kinds of people who build high-tech startups. I know these people very well (I live in ground-zero of French Montreal), they prefer to do other things, that's fine, it's not a judgement, just a reality. (FYI Bukowski was prolific - he wrote tons of stuff).
A 'circus' - yes. I can't think of any other place in North America where 'Cirque du Soleil' could be born. And it seems there's a huge plethora of 'artisanal' small-scale things ...
I like Montreal, which is why I live here, and I have no doubt there will be some startups here and there that will win, but it will never be the 'leader' in any classical, industrious lines of business. There will likely never be a full-blown ecosystem here for any industry that doesn't already exist.
The people here do not have any interest in building it.