My homenet is 1GBit, so is my Internet

I.e. no traffic beyond my legitimate saturation can reach the ISP

I have saturated my link with quic or wireguard (logical or) plenty of times.

The lack of any response on high data rates would be an indicator I've only tried that once and it failed gloriously due to congestion. I don't think there's many real protocols that are unidirectional without even ACKs