As Central was founded, all Research Societies in Tōtsuki Academy were forced to shut down. After the Yukihira Vs. Eizan Shokugeki had ended, Satoshi Isshiki ensured fair judgment in any future Shokugeki, thus initiating the Survivor's Purge.
(To be added)
It turns out that out of 33 Shokugekis on the first day of the Survivor's Purge, only the Cutting-Edge Cooking RS was able to grab a victory. On the next day, all defeated Research Societies are demolished.