most probably they are not certified, still in beta i guess, or just not much different. I guess to publish something officially in the site one has to go through some official permission some paperwork and nobody really want to go through all that for something that wo'nt really make any difference... it's not a private homepage where u publish whatever you want with little to none consequence.
Better safe then sorry the guy that write the driver is busy writing driver and doesn't really care much to ask his boss to ask someone else to ask the permission to.... etcetc
