Nobody is saying you should work for others for free. Tons of car mechanics do in fact spend their weekends tinkering on cars for fun. Some of them restore old

Nobody is saying you should work for others for free. Tons of car mechanics do in fact spend their weekends tinkering on cars for fun. Some of them restore old cars, others work on custom modifications. It's a whole part of car culture. Hobbyist auto mechanics absolutely are a thing. Of course, nobody thinks they're devaluing the work of other mechanics by scratching their own itch on weekends. Likewise, when I work on my own personal projects it doesn't "destroy the industry." I'm not doing bespoke work on other people's projects for free, I'm building stuff I personally find fulfilling.