You’re talking about one owner and one house. Zillow was attempting to do it at an industrial scale.
They were scalping housing.
"Scalping" makes zero sense in this context. Scalping exploits ticket mispricing and asymmetrical access to the market (waiting in line). Houses are bought at auction; you can't "scalp" at an auction. Try it at Christie's sometime.
They were literally scalping properties. And, like a scalper who has too much inventory, they’re now selling at a loss.