I'm right there with you, and have wished for these needless centralizers to crash and burn for decades now. But if we imagine that Instagram/Twitter/etc were out of the picture and these kids were selling their wares on decentralized P2P platforms - it would seem that the main thing that would change would be a lack of possibility to centrally study and police the behavior. In other words point #2 and thus the whole focus of the article would vanish, yet the overall behavior would still exist. Looking at it in those terms, it feels a bit ridiculous to be pinning blame on centralized platforms for having not fully controlled their users, when a fully efficient market just wouldn't have those centralized choke points in the first place.