How Google and Yandex store an infinite number of photos?

Question

Google

How Google and Yandex store an infinite number of photos?
In their database, images are stored as a set of pixels, then you can easily identify a duplicate and store only the originals. Pixel combination options are limited.
One 32-bit pixel is 16777216 options. One pixel takes 4 bytes, so single pixel images will require 4 * 16777216 = 64 MB of storage. For images in 2048x2048 - the combinations will be 16777216 * 2048 * 2048 = 70368744177664 (right?), which will require "only" 256 TB.
So what happens?

Answer 1

What nonsense.
First, the number of images in the search engine cache is never infinite, just very large.
Secondly, images are not stored in the cache in their original resolution - their size does not exceed 300-something pixels on the long side.
Thirdly, most images are still stored compressed in JPEG. In practice, their size will not exceed 15 kilobytes (usually less than eight).