Except that in this case, there are still just as many tomatoes at the stand when they leave. Oops, doesn’t fit your “stealing” paradigm very well...
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Has the artist received payment for his/her work? No? It fits the stealing paradigm quite nicely, IMO.
If I drive past the vegetable stand and don’t buy anything, the farmer *still* isn’t receiving pay for his labor. Is that also stealing?