I am a Canadian anglophone from British Columbia with highschool French. My children have been raised in the USA with no French. It would be easier for me to take a job and move my family to The Netherlands than to Montreal. (Not a hypothetical example. I turned down an offer a few years ago at a company that wanted to hire me there. My children would have had to learn Dutch, but would have gone to school in English.)

If you are founding a company and want access to anglophone talent, would you prefer to start it in Montreal or Amsterdam? What are the economic implications of this fact for Quebec?

Quebec has made a decision to value remaining French above economic growth. That's somewhat reasonable. But if you've chosen that, you should be honest with yourselves about the choice you made. And shouldn't be puzzled that your economy has not done so well.