It's the same as with "artist". Who is a real artist, who isn't? Is everybody an artist?
Just with "artist" I understand there's some privileges and historic context coming along with the title. But arguing about "developer"? It's like trying to define who a "real accountant" or a "real pilot" is. You do the thing for a living? You are it. You don't? You're probably not it, or at least a hobby-it. It's just a job dammit.
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