[dangero]

That does not solve it. A little technical response to your comment. The linked wikipedia page describes how TCP detects appropriate and safe bandwidth to use for transmission using 2 main techniques: 1. Detection of how long it takes to receive a round trip ACK message 2. Detection of dropped packets

Neither of those mechanisms guarantee that the client bandwidth has negligible effect on upstream data links or the bandwidth of other clients sharing those connections. The detection mechanisms are completely self focused on achieving the highest rate of transmission possible and correcting any changes to network reliability over time. They cannot create a reliable picture of overall bandwidth or the exact impact on other clients.