I had this exact same thing happen last week in one of my wordpress site, I had just inserted that script when developing to try it out and forgot to change it

I had this exact same thing happen last week in one of my wordpress site, I had just inserted that script when developing to try it out and forgot to change it for a local file or a CDN afterwards. As someone affected by this, I learned my lesson, but I was very happy about how the hotlinking was handled, I was a clear impossible to miss warning, with a clear and easy solution, I though it was only fair.