I don’t think children are the initial target of this company, but I get what you are saying.
The type of person who’s going to sign up for a course from this company are probably already autodidacts to some degree.
If I were teaching sixth grade mathematics, I wouldn’t be too worried yet. If I were running one of the many mathematics academies that have popped up throughout a lot of more affluent ‘burbs, I’d be very worried.