But there also was a time when electronics companies owned radio stations. AT&T once owned a radio station in NYC called WEAF. They ultimately sold it to NBC. But RCA, GE, Crosley, and Westinghouse are just a few of the companies that once owned radio. The fact that they don't is partly why Amazon is determining how we listen to radio.
The electronics companies also shaped the way we watch television. RCA developed the color broadcasting system that ultimately became the NTSC standard. Because RCA was both a television broadcaster (NBC) and a television set manufacturer, the company had ample incentive to promote color television.