@Mr_Mister People do those things with the time leftover after they do what is needed to support themselves.

And as fun as it might be to build something amazing in Minecraft, that is not productive. And firefighters who are volunteers do it out of love for their community. Not all open source code has value either.

Wikipedia has a lot of information, but it is also flawed. But it does have use.

Let us see what happens when people are not paid to farm.