how are the suggested bans determined?
the site looks for champions that are picked often and win consistently.
it balances the two factors by multiplying together (winrate - 50%) * pickrate. this is the 'op rating' which represents how often you will lose to this champion more than average.
for champs that are banned often, we estimate how often they would be picked if they were never banned by using (pickrate / 100% - banrate) for pickrate.
the final formula is op rating = (winrate - 50%) * (pickrate / 100% - banrate).
the champions at the top have the highest op rating and should be banned in a void of other information.