Earlier quoted context omitted.
So to clarify: if you do work with the intent of selling it to one buyer it should be protected, but if you do work with the intent of selling it to two or more buyers it should not?
No. Rather, the point is that you are paid for your work rather than a copy of the result of your work. This is just like a software developer working for a salary rather than somebody eking out an existence in an app store.
Will you ask for donations? What happens if you announce you will work on something and take a bunch of donations in the first couple of months (enough to live off).
What happens if the donations then dry up and you run out of money so you can't continue to work on the program full time but it is not finished? Do you have to go into debt to repay the people who donated or do they have to take a gamble that your program will get finished and be good enough?
Or do you only start work when you have sufficient donations to finish development? What happens if you misjudge this?