How to earn Braintrust tokens?

How can one effectively earn Braintrust tokens? Are there specific tasks or actions required to acquire them, or is it more of a passive process? Is there a minimum investment or stake needed to participate in earning Braintrust tokens? Can anyone from anywhere in the world participate in earning these tokens, or are there certain restrictions or requirements? Is there a specific platform or marketplace where Braintrust tokens can be earned, or can they be earned through various means? Additionally, is there a limit to how many Braintrust tokens one can earn, or is the earning potential unlimited?