OTT services, including a growing crop of virtual MVPDs, are clamoring for your ad dollars, and they have the eyeballs to warrant them. But this will not replace linear TV so fast. The content might look the same, but the dynamics of advertising on OTT are dramatically different and suggest this growing medium is going to evolve in interesting and unique ways. Kait Boulous of Varick discusses the role that challenger brands will play in shaping the future of OTT advertising.