unpaid work
This is like whining that a journalist doing a crossword puzzle is “unpaid work” because they use words at their day job.
None of these puzzles are remotely like actual work. It’s for fun. Can’t you just have fun for a couple hours?
I think I just don’t understand how people can have their hobby be related to their work without imploding. I had a cousin who became a proffessional chef and he cooked for fun. That job almost overwhelmed him because he had no escape from its stresses.
I would worry about that happening to me with coding