AR7200BX is put out by Horizon Hobby and is Spektrum/JR DSM/DSMX specific. They build a receiver into it because it is targeted at a specific subset of the market, Spektrum/JR transmitter users.
Ikon, Skokum, Gaui, 3Gx/Align, etc. are "agnostic" when it comes to Tx technology. They are designed to work with Spektrum/JR, Futaba, and any other type by use of either satellites or a separate Rx. They are not linked to a company with a vested interest in selling a specific Tx/Rx technology.