Tech valuations continue to get curiouser and curiouser
The interesting aspect of the purchase is the mindshare. I have kids in elementary and middle school and as far as I can tell, all their friends play it. When my kids went as Steve and a pig (from minecraft) for Halloween last year, they were drawing shouts nonstop from all the kids. Most parents had no idea.
How you turn that mindshare into money is math I don't understand.
WhatsApp was pricey, but that was driven by defensive strategy rather then pure financials.