The other courses (i.e ML and DB) seemed to have a different arrangement. The slew of new classes seemed to be following the same arrangement as ML/DB rather than AI.
Although I am not aware who was behind the development and operation of Aiqus.
Not sure if you're referring to the current bunch of courses or the first three (AI/ML/DB). I'm assuming it's the latter. Aiqus was only used for the AI class. IIRC it was set up independently but someone before the course began and ended up being the pseudo-official Q&A forum (linked to from the main site).