In my opinion, the kids only enjoy math activities when there is a supervisor or game coordinator in the class or maybe outdoor activities. This is a virtual place , more or less for junior or senior already so i donot think the kids will get a lot of benefit here.
I remember in my state, marketing people go around the suburbs to sell their expensive math products which consists of a lot of activities like you said but as far as for a long term studying they will feel bored immediately just after one or two weeks sitting in front of computer by themselves, it means when parents are busy for their own businesses.