And most art that people actually consume is not made by such hobbyists. It’s made by professionals because people who are able to make a living out of an activity tend to get much much better at that activity.

If it’s so trivial to do as a hobby with no economic output, then do it yourself or don’t use other people’s professional output. No one is forcing you to!

Artists are also welcome to publish their work directly into public domain whenever they feel like doing so for charity. You can always go visit your local schoolhouses to see hobbyist art.