You can't really. If you had no intention of making money doing this, this would be more of a volunteer activity instead of an activity where they paid you. Even if you are not setting the pay rate, this would be similar to getting a tip. You earned $5,000 providing a service to "gain experience".
A hobby is done for the love of the activity or for sport or recreation. A person with a workshop in their garage that likes to make different wood crafts, but doesn't need them all so he sells them to cover the cost of materials would be an example.
Doing something to gain work experience would fall into an apprenticeship type category which is not a hobby activity.
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