I know that at least two of the sites have been closed due to lack of interest/time/etc. I suspect this is the case with the rest of them. The reason they have suddenly disappeared is probably because a little 'spring cleaning' was done during the creation of the new site.
According to some it is extinct, but in the last few days since AD 2 was launched this forum has been getting busier. Now all it needs is a template to match the main site.
Excellent idea! I'll start making stupid accusations. Yoko Ono was responsible for EMI being such a pile of crap! Yoko Ono wants to steal your children! Yoko Ono is a major factor contributing to global warming... etc etc.