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Have you considered the possibility that the first two companies you've mentioned have just fooled you into thinking their product is complete by offering you a complete feeling experience? There's a difference between "this feels whole" and "there's nothing more to be done here". I would say those two companies have iceberg effects with their products -- the customer interacts with a very focused piece of it.

I would think Airbnb has the same problems with content, abuse, and fraud, except it's 100x worse because it's happening in real life.

> Facebook has continuous challenges with content/abuse/moderation

Facebook does that manually with contractors.