I scanned the responses, and didn’t see anyone who mentioned this.

The point at which the U.S. allowed you to “sign” your name by typing was when the E-Sign Act was passed. That was in 2000, long before LLMs were really a concern.

The reason was to make online commerce easier. Verbal contacts could and continue to be enforced, but enforcement requires more effort than with a written contact.

At the time I thought the law was passed by people who didn’t understand technology and how easy this made it for people to commit fraud or screw over consumers. However now I realize they just didn’t give a fuck.