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> They charge a dollar per successful customer session so they’re incentivized to make it helpful.

Doesn't that incentivize them to increase the amount of "successful customer session" regardless if that's beneficial for the (either of the) customers? Instead of resolving the query in one session, they could split it up into many, just helping the customer enough to be considered a success, but still so they come back?

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No, but even if it did, there is a third party keeping them honest, the business that doesn’t want to be overcharged for successes and doesn’t want angry customers.