There's also a class issue at play. If it can only be an unpaid hobby, then only people with the time to dedicate to it (in lieu of a second paying gig) and the disposable income to buy the necessary equipment (financed entirely by their paid job) are able to participate. For example, I work with people who are also working artists. They use the income from selling their art from their hobby to pay for those materials. It's not enough to live off, so it's not their primary income, but they wouldn't be able to participate in their hobby at the level they currently are if they weren't able to sell their work. Allowing people to profit from their labor makes these spaces more inclusive and diverse.