Actually, I was not even aware of this thing until last week when someone on a forum site mentioned it and the mod of that site banned couple of members for using this tool.
I found the link but that said it was a paid tool but offered to check my text if it was mine or AI generate. I typed couple of random lines and the tool declared it was AI generated. I lost interest and left.
So when I saw that book review by a member who invited me to review his book, I posted my comment but I knew content like that was available on the net @dime a dozen.

so when @jesusjacr mentioned me I thought it was another member trying to promote that tool. I made a sarcastic comment and left.

Thankfully that guy did not invite me to review his book or asked for my contact address like he did to you and Pet.