They’re not THAT easily forged; you need to have a copy of one, namely, and usually we don’t use signatures entirely willy nilly *and* they’re usually in addition to something else.
Also: Lots of the time you *can’t* just derive it from their name (some people do only part of their name, some people do first or last name or both, and then there’s Randal Munroe who has a damn stick figure in his signature).
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