The premium streaming services such as Qobuz and Tidal use TCP/IP protocol to deliver bit-perfect data to your streamer.
Back in the day when I wrote software for telecom products we used Real-time Transport Protocol (RTP over UDP) for our Voice over IP data path. I don't know if any audio streaming platforms use it.
My audio network is a combination of copper and fiber with good quality components and lots of bandwidth capability so I don't worry about my streamed music (Tidal, or ripped WAV off my NAS) making it to my Bricasti Roon bridge and DAC.
However, I recently moved my Roon Server which was physically 2 stories away from my listening room (and 2 feet from my NAS and local music) into my basement equipment rack and plugged it into my router that feeds ~10 feet of fiber to my audio rack, and I thought it sounded a lot better. I was not expecting this...
Those 2 stories are connected via a MoCA 2.0 network (I thought this sounded better than Powerline) which should have lots of bandwidth. So the Roon Server now goes up those two floors to get the music, but the Roon Server's output only has to go in one copper port and out the fiber port to hit my audio rack. I'm not sure why this setup sounds better to me.