Activision no longer even has the Transformers license so I don't know if the terms of their license would even let them keep the servers going (not that they would anyway, they're cheap so-and-so's). Or am I wrong on the license terminating server infrastructure deals?
Maybe, maybe not. It would depend on the terms of the license. So I didn't introduce that variable.
I have a list of all G1 characters that have been released in CHUG form. You can find it here. Please feel free to let me know if I got anything wrong so I can fix it.