It's technically correct if you are a Marxist as Marx used the term that way. Otherwise the dictionary has "The action or fact of treating someone unfairly in order to benefit from their work."
I agree with you (at least assume strongly that I do), but I couldn't find a dictionary with that as the first definition. Most of the first definitions were more along the lines of "make full use of and derive benefit from (a resource)", making GP technically correct.
