This is not true. TCP will retransmit, yes, but TCP congestion control will also reduce the transmit rate in response to lost packets. Overall, proper TCP imp

This is not true. TCP will retransmit, yes, but TCP congestion control will also reduce the transmit rate in response to lost packets. Overall, proper TCP implementations will back off to approximately their fair share of a contended bottleneck. The application layer sees reduced throughput, not message loss. New TCP connections start with very conservative transmit rates, so an application which is overly aggressive in abandoning slow connections and retrying will not add substantially to congestion. UDP doesn't necessarily have these properties, but anyone who implements a high-bandwidth UDP protocol which isn't TCP congestion control friendly deserves public shaming.