Yep. Jpeg compression.

You can get away with compression in a lot of audio far more than images and video where compression causes instant noise and halo fringing adding big differences in contrast. It also knocks down the greyscale levels, meaning the contrast is reduced, causing slightly more washed out images and less blacks.

The problem is many consumers now view images and watch videos almost exclusely on mobile phones, tablets and modern TVs which mostly now have higher contrast screens that boost colours and contrast, so most don't really notice these degradations. But it instantly becomes apparent if you then try to print them.

For me image compression is quite noticeable as I've worked with image editing for a very long time. But for most they just don't notice it. Similar to audiophiles who can instantly hear a digitally compressing and clipped audio file over an uncompressed version.