I was applying recently to a role that was pretty interesting and so I wrote the email on the train on my way home, didn't have my laptop with me.

In the email I wrote out everything myself, absolutely no use of AI, but after I hit send I realised there was a pretty silly typo, nothing grave but it irked me.

I decided out of boredom to see would my email be considered AI as it was probably going to go through a million filters these days, I popped it into an online checker (I don't know the quality of these so who knows) and it told me with 75% certainty it was written by AI.

It was not at all. It was written overly hastily on a phone on public transport. So I wonder how someone who might be grammar orientated and particular with the semantics would prove otherwise.

I can see a company needing to find any excuse to let people go saying "well theAI says you used the AI to do your work, we're letting you go"