Why is old azureus 2.5.0.4 allowed at all trackers?

[kadake]

i hope sites dont start banning 2.5.0.4 , even with the classic interface on the newer version still dont feel like good old 2.5

[xJohnxSmithx]

I have been using this client for 7 months. Since this time many newer azureus and utorrent clients have been banned at most sites. The reason I ask is because recently one of my fav sites has banned this client. No other tracker i know of has ever done this. So i was wondering if any intelligent fst ers happen to know what is so good about the client. I have asked in their forum but have got no response, so any fuel you can give me would be appreciated.
Cheers

This version of Azureus has been re enabled at your fav site for the members that would rather stick with it over the newer version.

Thanks to the great people at one of my fav sites. Your quick action shows once again that you are top rate.
cheers