I can almost guarantee you they are making a large amount of money on abandoned funds. You'll have people that just don't want to mess with it, especially if they have smaller amounts in the account. They also really didn't allow a ton of time, especially for recreational gamblers who may only play every couple months. You'll also have people who don't have their current email that didn't get the notification. I also think there will be people that go YOLO with their balance and bet it all + lose. It's shady business.