Wow, I had no idea it made that much money. My kids love it.
I think what makes it stick is that it's more than just a game. It's a social space where my kids jump in to sometimes just to chat with their friends from school. Reminds me of hanging out in Team Fortress 2 game servers and just chatting while casually screwing around in the game.
Here's the interview where those stats came from for those curious.
https://venturebeat.com/games/how-gorilla-tag-made-it-big-on...
Gorilla Tag, an indie VR game where you're an ape and run around with your hands and tag people (seriously, that's the whole thing) has made $26 million selling virtual hats and has peaks of 90,000 concurrent users.