It has nothing to do with the DATA.
Power your DAC with a poor power supply instead of a LPS, and it won’t sound as good.
Why? Because the noise-floor is higher.
The same thing goes for the streamer that is connected to the DAC… Its electrical noise is channeled to the DAC with the DATA. And it’s the same for all the LAN.
The beauty of these cheap optical converters is that they eliminate completely all the electrical noise of the LAN. With them, the quality of the Ethernet cables in the LAN does not matter. And the noise level of the server, and the other devices does not matter as well.