I don't understand the pricing of Image Resizing and Transformations

Images Transformed is a post-paid pricing dimension. If your images are not stored on Cloudflare Images, you will not be billed for Images Delivered pricing dimension and do not need to purchase Images Stored. Transformations cost $0.50 per 1,000 unique transformations per month. A unique transformation is defined as a request to transform an original image with a combination of supported flags, with the exception of the format flag. The format flag being exempted from counting as a unique transformation means that if demo.jpg is resized to 100x100 and is delivered to some of your users as webp and others as avif or png, it will still count as one billable transformation for that month instead of three. Images Transformed count is not impacted by the cache hit rate. This makes estimating pricing more predictable. For example, 1,000 product images that are resized 5 different ways will result in 5,000 unique transformations per month and cost $2.50.