Do you think it's fine to sell something that you got from someone for free?

If someone is giving away something they don't need or ever even used, I don't see the harm in making some sort of profit over it. (I'm not talking about taking from the government because that is coming from taxpayers. I'm talking about random people online just giving things away that they don't want or need simply because they don't need the money or they just want it out of their house immediately.)

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