I see what you're saying but I don't fully agree. Art is the obvious counterexample, like the poetry circles of old. The hobby was writing and sharing your poetry with peers. If no one was reading it, there would be much less joy in the production. That doesn't make it a job, it just makes it a social hobby.

The thing with that poster is that the output is not wholly art but also utility, so the AI could fully subsume that thing, if the consumers only care for the utility part. And software in general, qua art, is not an art that anyone but the author consumes, except for video games. So you're kind of right but also I think OP was using software as an artistic outlet through a utility output, which was neither a job nor is his current despair unfounded.

OP if you want to keep writing software for others you have to abandon the utility function and make art, such as games. That will fix your issue. And no, AI cannot make games as good as a human can.