I didn't really notice this until I posted my newest Piers drawing, but why is the quality of images on instagram actually terrible?

Here's the original drawing:

And this is what instagram did to it:

Like what the f*ck instagram you're making my art look worse (than it already is). You can't even tell what the small details are, and I've already explained that I love the small details. Honestly it's just a slap in the face.