They do. But as others have said, they have to comply with the laws of tax appraisal in their state/jurisdiction. In Texas, for example, tax appraisers can only ask you to voluntarily ask you how much you sold a house for. You’re not obligated to tell them, and they can’t rely on third party sources for sales data.
They also have to appraise tens (or hundreds) of thousands of properties every cycle. They can’t do a physical inspection of each house.
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