As a person that bans none, I don't understand everyone's concern with banning none. Like, really, look at it this way. You'd prefer me to ban Alistar, who's basically never seen, rather than ban none. Banning Ali would mean my ban only has relevance in about 3 games of a hundred, THEN, when Ali is picked, he has a subpar WR and is statistically likelier to lose than he is to win. My point is, it's oftentimes worse to ban something than it is to ban none.
Everyone conveniently ignores this point while complaining about people who ban none, because it "hurts their winrate." What hurts your winrate more than someone banning none is someone banning the 45%~ WR champions that are Sylas, Yuumi, Irelia, and Yasuo who's pretty much always sub-50% WR. You know who bans those champions? Pretty much everyone. People who ban none aren't the big offenders here, but they're going to get insulted for being "faker wannabes" anyway.