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Image CDN primarily offers image resizing, especially useful for responsive images. It has a sizable market, both Cloudflare and AWS offer image processing service, see also major players like Cloudinary and Cloudimage.

Image and general CDNs are not exclusive: pictures resized on-the-fly and hosted on image CDN, while html/js/css hosted on general CDN.

I think this is for blogs/sales pages using shared hosting maybe also people who likes sharing images on forums. Uploading an image and then copy pasting the link looks a lot easier than navigating CloudFlare or AWS. Basically, if you feel comfortable with big cloud user interfaces then you are not the target.

Given Akamai, Cloudflare and Fastly all offer image processing this isn’t a market I’d get into