let me lay down some facts around the matter...

ROMS = legal if not kept for more then 24hours !
EMULATOR = very legal !

see... its never the emulator that is considered illegal, only the roms !
as for the GENESIS roms... THEY ARE LEGAL !
why ?
sega of america announced themself their opinion about the roms.
they were happy to them going as they were happy to see that most of their games on genesis are still going on and being played ! they also said, they never cared for the games and copyright, as they were just happy to see the roms being played even 10 years they came out !

basically...
genesis roms = not legal, not illegal either ! they don't care at all about this !
NINTENDO ROMS = VERY VERY VERY VERY VERY VERY VERY ILLEGAL ! nintendo is completely against the whole roms/emulation ! they even tryed to pinpoint some major sites like ZOPHAR.net to completely stop their acts ! but fail miserably ! nonetheless... roms are still illegal if its not SEGA !

as for the ban...
they aren't fast !
only some of them are !
not all !