Generating Income from Open Source
[old person rant]There is nothing wrong with developing software and selling it. 
It used to be the norm and it is still quite common.These days "open source" is virtue signaling and expected "to be cool".
That people then grump about not being paid shows that they 
are not particularly interested in the concept of open source.However, the term open source has been used for so many different things
that is has lost most shared coherent meaning.
I guess that is why "Libre Software" is now being used by some.What is plain hypocrisy to me are the people who developed "for profit"
open source projects, and are angry when they dont get paid enough,
when the projects they have created rely on GNU tools, the Linux kernel 
(Perhaps Debian), a libre software database on so on.Their product is built on the shoulders and sacrifice of other open-source folks that often is not getting paid or not paid enough.For profit open source should have clause of donating X% of profits 
downstream to the open-source projects they rely on. 
(Since they would have no product without them)There are some core and vital open-source projects that have enormous
importance for millions. 
I think supporting them should be a priority.A lot of modern software is "open source" until it become inconvenient
and they introduce "Pro", or "see source", or shift license entirely.A lot of companies should just be "for profit". 
There is nothing wrong with it 
and nothing wrong with making money,
or making money off of open source.  
I do nitpick on people who see open source as a way to get 
paid and they are angry if they dont get it.