Pictures are hosted by this server gave broken for who haven't visited the site yet

My website URL is:

What I’m seeing is: i noticed it days ago. i had a little guide for php coding about random image at every refresh:

that’s the picture i’ve made:

that pic and other pics hosted by IF don’t loud to who haven’t visited the site yet and they can open these when they launch VPN. what’s the problem?

I’m using this software: i don’t use any themes exemple wordpress and etc. just phpbb and that will removed

Additional information:

Hotlinking to things hosted on free hosting is not possible. You can upload images to your website hosted with us, but those images can only be shown on the same website and nowhere else.

This is the security system responsible for this:

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