What exactly has been done to this image?

[mikef20194927]

Hello everyone,

I stumbled upon this photo https://imgur.com/a/XhPYiXX and would like to know what exactly has been done to it? If you tilt your laptop's screen like this Imgur: The magic of the Internet  , you will notice that there is a noise that has been added to the image and there are shades on the edges of all objects.

It kinda seems like a degradation of quality has been done to it.

What do you think? What feature has been used to alter the image this way?

[Semaphoric]

Saving as a Jpeg with a low quality setting.

[andreamaestri]

It looks like there has been some Compression artifact - Wikipedia  In Photoshop, you can use Export > Save for Web

And for the shades are probably sharpen after exporting, as consequences multiple compression are most likely to produce that kind of image.