Reminds me of the letter Bill Gates wrote about hobbyist programming (almost exactly 40 years ago). "Who can afford to do professional work for nothing?"
To answer the question of whether his work is "undercutting professional photographers", look at the Free Software Movement. The movement has been wildly successful; GPL code is pervasive. Yet, the number of programming jobs today is at an all time high, and still growing. No undercutting happening there. Instead, GPL projects (like Linux) enabled the creation of programming jobs that wouldn't have existed otherwise (like jobs at Google, or Facebook, or Netflix, or...).
He's doing what he loves, and there will always be people who do what they love for free. But I don't think what he's doing is taking away the ability to still get paid for the same kind of work.
To answer the question of whether his work is "undercutting professional photographers", look at the Free Software Movement. The movement has been wildly successful; GPL code is pervasive. Yet, the number of programming jobs today is at an all time high, and still growing. No undercutting happening there. Instead, GPL projects (like Linux) enabled the creation of programming jobs that wouldn't have existed otherwise (like jobs at Google, or Facebook, or Netflix, or...).
He's doing what he loves, and there will always be people who do what they love for free. But I don't think what he's doing is taking away the ability to still get paid for the same kind of work.