"Actually, percolation collapses if the individual "cells" *resist* percolation with probability p > p_c."
I said:
"For a simplistic version of this, we will assume that the app works perfectly to stop spread, and that all people infect their four neighbours."
I was giving that as an explanation as to why there are counterintuitive sharp boundaries in these sorts of problems. The same applies with assuring randomness in shuffling, and other mixing phenomena.
I think the model is not applicable because it assumes that all humans are standing on a square grid, rather than the app doesn't work very well.
Biting the hand that feeds IT
