Interesting comment. Here are the results:
Big Ten: West has gone 0-9 since 2014, though Iowa lost to Mich St 13-16 in 2015 and Wisc lost to Ohio St 21-27 in 2017.
SEC: (by far the longest championship game, and its two divisions have ebbed-and-flowed a lot)
since 2009, the East has gone 2-12, though now Georgia looks to be establishing itself as the top program
ACC: since 2011, and excluding the covid year, the Coastal has gone 1-10.
Big 12: had divisions over 1996-2010. In that entire timeframe, the North went 4-11. From 2004 onward, the North went 0-7.
PAC 12: had divisions over 2011-2021. In that timeframe, the south went 2-9.
https://en.wikipedia.org/wiki/Big_Ten_Football_Championship_Game#Results
https://en.wikipedia.org/wiki/SEC_Championship_Game#Results
https://en.wikipedia.org/wiki/ACC_Championship_Game#Results
https://en.wikipedia.org/wiki/Big_12_Championship_Game#Results
https://en.wikipedia.org/wiki/Pac-12_Football_Championship_Game#Results