Google's Privacy Sandbox imposes six major challenges on digital advertisers, IAB Tech Lab Executive Vice President and Chief Operating Officer Shailley Singh writes in an op-ed in AdExchanger. Singh said the issues include the Privacy Sandbox relying on interim features advertisers must adopt but the end-state of the interface is unclear, a lack of commercial guarantee from Google, and building ads using two different sets of technology for the sandbox and another for real-time bidding.