I was thinking the same thing, but then if you release the cert file publicly, you CANNOT trust that people will not try to use it in the old CDN downloaders and instaban the cert.
So if certs can still be used to download updates, they still most likely won't be released publicly anymore, as ANYONE can troll the cert and instaban it.
But I'm also interested if anyone has experimented with their own/private cert with downloading updates of games you do not own. This should be equivalent to users updating in OFW the XCI games they played, so if it's also an instaban, we should start hearing about it in the ban sticky thread as a lot of SX OS users update their XCI games in OFW.