Modern networks are moving toward . Instead of looking at domains or ports, DPI looks at the content of the packet. If it sees a video streaming protocol, it kills it, regardless of the port or proxy. This eliminates the gray zone. It is either a perfect imitation of legitimate traffic (unblocked) or it is detected (blocked).
lives in the chasm between these two states. It refers to a situation where the primary content loads, but ancillary features do not. more or less unblocked