On PC, there is a five-second countdown before a mid-roll ad plays. It functions as a useful warning and I'm glad it's there. Why is it not on mobile? It throws the viewer completely off guard when a mid-roll ad pops up out of nowhere while watching a video, with no warning. Really tends to ruin the moment. You're obviously not going to ease up on the volume of ads; at least give us a warning like you do on a PC browser.