Condé Nast, publisher of Vogue, Vanity Fair and GQ, has revealed it opted out of joining the Guardian-led Pangaea alliance, believing that its unique content is best suited to selling inventory programmatically in a “bespoke, controlled” manner. Speaking at The Drum’s Media Slap event in London today, Malcolm Attwells, programmatic sales director at Condé Nast Digital, urged caution to the rising number of publisher alliances.