Maybe because it sometimes feels like work. So if it's kinda like work, why not do something that is also not productive but would either not feel as though it's work or if it's like work, that you can actually enjoy.

For some the latter is facotrio. I tried it myself, didn't get past the demo. I think if I'm doing something not productive in terms of not using my time towards something that actively makes me money, I would feel better doing something like learning another programming language, do some quick projects to automate parts of my life, try to write myself a game or a piece of toy software that challenges me and is also fun to implement.

I think I'd rather do those than play facotrio.