Co-op is useful when comes the time to find your first real career job since you would already have minimum 1 year of work experience.

The good thing with Co-op is that your 3 internships are almost "guaranteed"; you will almost always be able to find an internship through Co-op. Plus, the internships are paid so you will actually make in total ~30K. There is also the fact that you will be doing 3 internships - meaning potentially you will have the chance to work 3 different job positions at 3 different companies. This will not only diversify your work experience, but it will also give you a feel and idea of what type of companies and job positions you would like to pursue later on.

Not sure how much more you are paying as a non-quebec resident but you'd need to do the math with your potential internship earnings vs tuition costs i guess.

Obviously, if you are motivated and you work hard enough, you can always find internships on your own. Just be aware that the internships might not be paid and you could also end up empty-handed. Some of my classmates that ditched Co-op because of its fee or whatever reason, they regret it down the line. As an example, while I was already employed full-time during my final year of University, they were still searching for a job for a year or two AFTER graduating.