It's not even meant to be subtle. Everybody knows how it works. You receive some gadget form a manufacturer, you present it in a positive way, you can keep it a

It's not even meant to be subtle. Everybody knows how it works. You receive some gadget form a manufacturer, you present it in a positive way, you can keep it and expect more to come. If you break the rules, you won't receive the next one. There is no incentive to break the rules on either side.