All LEDs are backlit, and a full 1080p on a 7 inch LED screen is a dogshit reading experience that will make your eyes bleed in about 2 minutes. If you manage to find a terrible OLED at a low price, it’s still emissive and still absolutely terrible for reading.
Free is obscenely overpriced for using a budget LED tablet as a reading device. It’s terrible and has nothing going for it. Don’t pay a penny for a device you intend to read on with any display that isn’t epaper. You won’t read on it because it will be a torture device.
If those sites think that being linked to is a service they’re providing Google (which demanding payment implies), then Google is just fulfilling their wishes.