Why do photos have less info after AI?

Why do photos hve less info after AI

You need to explain what you mean.

Why is the MB often smaller after I run it thru topaz AI. Thanks for the fast response. Kay

File size == quality/ information.

If you start with a bad noisy image and denoise this you will get a smaller file size for the result in spite of the denoised image being better just because (.jpg)compression works better without noise.