They're not just from AI-generated text. Some of us humans use en dashes and em dashes in the right context, since they're easy to type on macOS: alt+hyphen and

They're not just from AI-generated text. Some of us humans use en dashes and em dashes in the right context, since they're easy to type on macOS: alt+hyphen and alt+shift+hyphen respectively. On both iOS and modern Android I believe you can access them with a long press on hyphen.