Intetesting feature: transfer statistics between devices with a code. So they are keeping stats on their server without an account but with a way to identify d

Intetesting feature: transfer statistics between devices with a code. So they are keeping stats on their server without an account but with a way to identify devices. Or the stats could be on the device until the transfer procedure starts. I'm on my phone so I can't check what they are doing. Then you type that code to another device and they'll be able to link the two of them. "transfer" should mean that the stats are no more on the original device. That would mean that they delete the cookie (or whatever) and any trace of that device on their server. Maybe it is even possible to make the two devices communicate between each other without going through a server. I think it's been done in web conferencing but it's too late on the night to research the matter.