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Maybe incorporate an Ubuntu-style 'suggested payment' part to the signup? You could have one or two reminders during the course if they choose 'Free'. Or supplement with paid-for content that goes beyond the course?

I agree that it's a lot of work and wouldn't be unfair to seek some compensation.

Obviously I don't have insight into what the creator will be doing with it in the future, but what I fully expect is these videos will be free, but the additional videos on React and other frameworks/languages will be offered at additional cost.

not a lot of people have money to just pay for everything on top of daily living bills. Less people would use it if it involved money.