Open vs closed platforms in ad tech

We need open platforms:

That is, marketers are concerned about platforms — namely Facebook and Google — restricting third party ad tech companies from operating on their networks. It raises questions about whether Facebook and Google’s ad tech products can be trusted to function objectively, or if they’re merely being used to funnel ad spend through their respective media networks.

via Marketing woes in the ‘walled garden’ era of ad tech.

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