Not everything. Take cooking, one of the most basic hobbies. It's easy to come up with recipes that you enjoy that you cannot order anywhere.
Or the comment here about designing your own clothes, same idea.
I could read that as: wanting to do something interesting that others would benefit from.
Though, I don't really think that's a good reason to filter out things to be enthusiastic about.
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Not everything. Take cooking, one of the most basic hobbies. It's easy to come up with recipes that you enjoy that you cannot order anywhere.
Or the comment here about designing your own clothes, same idea.