`user.email` is always my email.

`user.name` is either my account name, or model name like `gpt-5.5-high`.

I can easily filter & blame which line was written by me or some specific AI

“Sent from my iPhone” isn’t an authorship claim.

Microsoft should be broken up into a dozen different companies and it's quite clear they violated their consent decree from the US DOJ a few decades later, so they should get punished extra hard. Maybe nationalize Excel putting it in the public domain for starters.