Why would anyone that has the "secret" to trading profitably in cryptocurrency offer this as a course to others?

And with that I mean a paid course. Plain and simple because they will make money from selling these courses.

Think about it. Why would they ever need to offer a paid course if they are so successful in investing? And if they really have the secret why would they even bother to share it with anyone? It would be detrimental to their own success.

The secret here is that you will be paying their success. That's how they operate.

Surely you can learn something, but regardless you are their main income stream. There's more than enough information available freely for you to study and become better in trading or understanding cryptocurrency trading. You can educate yourself.

Be careful with any course that offers you guaranteed returns. They are guaranteed with returns from your subscription fees.