Advertising platform The Trade Desk has reportedly been secretly building its own operating system, based on the Android Open Source Project (AOSP), and could launch as early as the beginning of next year. This news, first reported in the Lowpass newsletter, suggests that the Demand-Side Platform (DSP) will directly be competing with mastodons like Google, Apple, Amazon, and Roku, which operate smart TV platforms, as well as more directly with TV manufacturers and their proprietary operating systems, like LG (webOS) or Samsung (Tizen). With an overly saturated TV OS market, what would push OEMs and TV brands to select The Trade Desk’s operating system over any other? There are no Trade Desk TV sets or streaming platforms, so no default…