thunderdragon but the images and videos - Which load from non-whitelisted domains - Of course are
I presume you mean the images that are uploaded into forum posts. Those are rehosted on giffgaff.
For example, this random bit of screen capture:
isn’t being downloaded from a third party server – it’s rehosted at
https://community.giffgaff.com/assets/files/2020-10-26/1603744087-889530-image.png and therefore is free rated.
Links are different – but only if you click on them. Just having a link in a post will not use up any of your data allocation.
Videos are different too – but for no apparent reason. Video previews are currently displayed directly from the site their hosted.
That’s bad for more reasons than just that it uses up your data. It also unnecessarily leaks trackable information to the spyware on sites that host videos. Properly done, the forum would rehost the preview image on the free rated giffgaff server, the same as it does for uploaded images.
There’s also an exception to the exception about links not using data unless you click on them. This, for instance:
The above ought to be just a link, and therefore shouldn’t be using data unless you click on it. But somebody, presumably at flarum not at giffgaff, has decided to convert that link to an image which doesn’t get rehosted on giffgaff.
It’s not just amazon. There are other sites where what should be static links and should not use up your data. But because the preview isn’t rehosted on giffgaff like ordinary images, those images are not using free-rated data. Therefore, that link does use up your data even if you don’t click on them. They also cause unnecessary trackable information to be leaked to amazon and the other sites where this is done.
But there’s no reason why preventing that should need to be an option.
All of the above previews could and should have been rehosted on giffgaff, exactly the same as uploaded images are, and therefore they too would have been free-rated images that don’t use up your data and don’t leak trackable information to third party sites.