1. Distance Education (e.g. online courses) require a serious student, and may not be suitable for children unless the parent is closely supervising.
2. Cost isn’t necessarily cheap for a frum family, so distance education providers generally do not give discounts based on family size or poverty – unlike frum schools
3. Some subjects really require a teacher, such as ones involved in acquiring language skills, The more interactive the course is, the more expensive it is.
4. Unless someone is hooking your house up with their own dedicated wires, you are accessing the same internet that everyone is. A “kosher” internet is just a program to keep you from looking at sites – and can easily be evaded.