Why would you choose not to ban anything?

Just wondering what people's thoughts are when they choose not to ban anything. Just had an adc ban nothing. Not like he was too late and panic banned nothing, but in the first second of the ban phase banlock none. What could the reasons be? EDIT: Yes it was ranked. Asked the Jinx and she told me: "this elo is not my main elo, I'm actually higher on my main. I want to train playing against any matchup, that's why I don't ban anything." Proceeded to play below average (garbage in her own words) but we still won ^_^
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