Wasalam
May Allah bless you.
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Please see the link for the thread on dropshipping: Fatwa: Is Dropshipping/Drop Servicing Halal?
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Network marketing can be shariah compliant. It all depends on how it is structured. Usually, in the conventional sense, most scholars do reject networking marketing as being shariah compliant. Even some of those scholars who allowed it at the start, made a U turn to consider them as non compliant.
Also, for such contract to be considered shariah compliant, the subject matter too must be considered halal. In your query, you have mentioned teaching services for trading forex. Conventional forex trading is not halal. So this issue must be addressed too.
Selling gold crypto too must be completed in a shariah compliant manner. So the educational services provided must be reviewed too.
And Allah knows best!