Artstation doesn't let you filter out AI art, so there will be AI art alongside human art. There was also some issues about if artstation is allowing AI to be trained on what you upload.
Deviantart had a similar issue, and now have an AI art generator on their site.
Instagram is obviously selling all the data they can about what you do/upload, training AI on it etc.
Oh, is that search filter account wide? Will take a look when I got home.
Did the no ai art protest on there win then, or were they going for a complete ban?