Yes, it's actually not surprising, we even know it from the total active users every day between 12k - 20k daily active users in the chat room
And please note that not all users can send messages in the chat room only users with min $500 wager meaning that there are definitely still many gamblers who are not recorded. I believe massive promotion is one of the main factors.
Massive advertising in popular sports (UFC and soccer), ongoing casino and sports promotions and being online since a couple of years has helped to the succes of Stake! It has probably already been asked here before, but I think Stake has to be the biggest crypto casino in the world given all these numbers?