I disagree. The Free Software movement and the GNU/Linux operating system weren’t created for profit, but for user freedom. There is nothing wrong with making money in an ethical way (unlike what Reddit does), but that is not necessary for projects to survive and there are plenty of examples of this. Debian for example is a fully free operating system and it’s maintained entirely by volunteers for free.

The Free Software Foundation, Mozilla Foundation, Blender Foundation. They are all non-profits.