Roku City, the oddly alluring cityscape screen saver, scrolls across millions of idle TVs every day. Recently, an island paradise appeared in the picture. In the foreground, a floating billboard invited me to subscribe to Disney+ and watch Moana 2 at the press of a button on my remote. The convenience, I don’t mind about the new era of ad-supported everything. The wiretapping, I do.Ads are obviously not new on TV. As long as we’ve been watching shows on glowing boxes, we’ve been watching commerc...