I don't think you are taking a risk. I should say that you throw stones and ask directions first and try to participate. For example, if the same course is free, most of us will not cherish it. If it is paid, most people will take the course seriously, such as You have not bought Bitcoin. There is a high probability that you will not study Bitcoin seriously. If you buy it, then you may really understand and study Bitcoin. Don’t ask about the income first, I think it will bring you more than just It is gains, thoughts, and a world different from the current world.