To survive the creative, economic and emotional chaos of a life in photography your career must be designed for longevity. To achieve longevity, you must reconcile the conflict between what you shoot for money and what you love to shoot. Ideally, you get paid to shoot exactly what you love to shoot, every day. Reaching this nirvana requires making tough choices, a careful business strategy and attention to basic business practices. (Or be super talented/lucky, born wealthy or marry a brilliant business manager.

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It now seems that there is a phrase for it : subject echo. You heard it here first

This is not to be confused with the outright plagiarism of ideas or leeching as i call it, a common trait of  some of the less scrupulous photographers out there.