Thank you all for your opinions.
I also received the warning in July, even though I was only downloading two or three files per day. Since then, I haven’t used StreamFab.
While doing some research a few days ago, I came across this article that explains where the warnings come from
https://streamfab.dvdfab.cn/blog/amazon-prime-video-warning-emails-and-streamfab-security-upgrade.htm
So it’s not that Amazon detects the downloads, it’s a communication error between the software and Amazon since Amazon’s API update,which triggers the sending of emails, which according to Streamfab has been fixed.
So I wanted to see if anyone else had received any more emails, but I get the impression that everything is back to normal. But what will happen if Amazon decides to update the API again?