Is there a way to stop this?
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Practically speaking, disabling hotlinking can be achieved by looking at the REFERER attribute sent by web browsers and not displaying the image if the REFERER is not approved.
It might be technically possible to make the images video streams and use DRM technology (like Netflix use [Widevine] ) to frustrate downloading but this is likely super expensive and likely to provide very limited protection and a bad user experience. Remember there is always the "Analog hole" - ie taking a picture of the screen - either literally or figuratively - if someone is desperate enough.