@otherthings 1000%.
I do think there's a natural shift happening in the maturation of the internet that relates to this. The internet started with this open sharing culture where putting anything online felt like contributing to a commons. But then capitalism entered the chat. And now we have it sharpening to a point where it's doing precise kinds of harm. Artists have been online for ages and ages, but rarely are they the builders, or close to them. Flickr's culture was and remains legendary.
@edk @otherthings My sense is that Pinterest's culture and Tumblr to an extent was where I saw the most resharing out of context (not that Insta or Twitter didn't contribute). But definitely both of the former were kind of collage-y, mood board-y and fandom heavy in ways that promoted "these are part of my identity".
I think attribution was always more popular where doing so was seen as building a social network (and trying to promote friends and admired sources).
Age plays a role too...