This is exactly what non-artists assume artists do art for.

The reality is that most professional visual artists work in publishing, marketing, entertainment and the like. It’s a regular job. The incentive is money. Similarly for theatre, music, video, dance, etc etc. Artists can’t feed their families off exposure and expressing themselves. Their work has value and taking that work to create free derivative works without compensating them is theft.

Also right, it won’t destroy the hobbyist’s interest in having a hobby. But IP law was never intended to protect hobbyist interest.