Where did you find that offer?
From their FAQ:
Where do I buyeverynet-compatible devices?
We don’t sell devices directly. Instead, you can buy them from manufacturers around the world. Any LoRaWAN-compatible device will work with everynet.
....but also:
Does everynet cover my region?
We are growing our network all the time. LoRaWAN transmitters are simple to install, and cover a wide area. And because we use protected ISM frequencies, everynet works everywhere in the world. We’re excited about bringing everynet to new places. So if you need us to cover a particular location, get in touch.
All quite vague; looking at that website I don't feel like spending any money there, but I don't see any pricing for their services either.