Sadly thats not even the case for commercial applications.Final - no known bugs, or bugs are only minor/fixed in next release.
Well yes, in theory one of the RC's become gold. However the whole concept of alpha/beta/rc etc is messed up nowadays, people seem to just stick on a label on any unfinished product (looking at you Google (beta) !!)
... so please forgive us that we have used RC with a wrong meaning Also calling the almost finished product as a RC instead of beta will bring more testers for us