Yeah, the complexity of that flowchart just about sums it up, though
You credited the image in your post, but what kind of conversation would be had on forums if every post using a reference / inspiration image had to go find the original source? I posted in a commission painter's thread recently and found an image of a tree frog from my phone. That's already a bit of work to do when not at a
PC, but I did and posted it and had a discussion... if every image had to be linked to the original source, with no fair use on a forum, blog post, etc... then you would have less discussion than you already have (there has been a bit of a decline in forums in general as people resort to mobile).
Out of curiosity, why isn't a problem for Pinterest and the like to show tons of images from around the web in one place? (I've actually been wondering about that)
I can totally see someone needing to reference if they are posting an article and making ad revenue or the like, but it just seems like if the extremes were taken, very little could actually take place on the net around images like it does currently. That, or there would need to be a structural change, such that images automatically referenced where they came from or the like.