BANDWIDTH!
Its all over the internet, everyone has had some kind of run in with the silent killer, known as BANDWIDTH

Bandwidth is how fast the internet can download or upload your photos.
Every webserver has its own bandwidth, just like how every person has their own brain, and the more you use that body, the more crazy your brain gets
Bandwidth is the exact same, in a way
Every image has a size, some are large, some small but all still sized
When we put an image onto a website, everytime someone opens that website, their device downloads that image.
Since every webserver has its own bandwidth, everytime someone uses something from someone elses webserver, (like a image) the other persons bandwidth goes up.
They could take that image and change it to the worst thing you can imagine, which we dont want, so try and use your own bandwidth, and not others.