First of all, please get your LoRaWAN packet directions right. To TTN is uplink, to device is downlink.
Next, there is no such thing as free beer. For commercial use you will have to either invest yourself or spend with existing cloud providers that all want to make money and are not cheap. As @descartes already mentioned, TTN is not for commercial activities either, you need a TTI hosted instance that will cost money as well.