What do you see to the meaning of plagiarism, copying someone's else's work and claiming it to be from your own, be it images or articles, what does adding a reference link do to many of you that you so finds it a very difficult task to do, the only situation i may see this as needless is when the image content already have the source link or reference name on the image.

That will clearly shows that so and so company or organization published this because their logo, name or stamp is appearing on it, else, it is very important to also include link to any image you've got online except you're the creator to that image, this is not about being banned alone, but doing the right thing the professional way.