StackOverflow own what? 5 domains? stackoverflow.com, stackexchange.com, superuser.com, serverfault.com and stackapps.com . I can't see GoDaddy being that hugely influenced by 5 domains.
It's not the number but the influence of the entities behind them. If stackoverflow, reddit, and arsetechnica are commenting on an issue, you can be sure many will agree and join in.