Where did you get the 1/3 from?
Yeah, what is this about? @ranochigo
I can't find the exact research which concluded this. I think I reached the conclusion after reading this quite a while ago.
https://nakamotoinstitute.org/static/docs/on-stake-and-consensus.pdfAfter thinking about it, I realized that selfish mining also results in 1/3 of the network tolerance for Bitcoin.