[Paxinor]

nash equilibria can be broken through implicit collusion meaning people colluding unintentionally that is true.

but it can only be broken to a certain extend (depends on the game) and it will only be broken if players are NOT trying to maximize their EV... meaning that if everybody plays optimal, there is a nash equilibrium and important: implicit collusion to an extend that the optimal strategy is -EV there has to be a lot of implicit collusion meaning players using very extreme and exploitable strategies...

i have no proof for that, but if you don't create extreme samples its almost not possible that the calculated nash equilibrium turns into negative EV because of implicit collusion...

so implicit collusion is really not a big deal... again no proof just experience...