One-time startup thePlatform, was acquired by Comcast in 2006 from founder Ian Blaine; it’s been operating as a standalone unit since, but, no more. The company said it is now under the guidance of Comcast Wholesale. Marty Roberts, co-CEO of the company for a little more than the past year, has left the Seattle-based online video platform and Jamie Millar, who served with Roberts as co-CEO, now will report to Comcast Wholesale SVP and GM Matt McConnell.