Can the Raspberry Pi work with Ethernet using a USB-Ethernet power adapter?

Question

I have a Google Chromecast Ultra power adapter which includes Ethernet. My thinking, this is a USB to Ethernet adapter that also provides 5V power.
Does this work with the Raspberry Pi Zero W to give it Ethernet? From my testing, yes, but I needed to use the USB-data port rather than USB-power.
As far as I know, you can power the Raspberry Pi Zero W over the USB-data port with no problems, but I'm not exactly sure. Could someone clarify?
https://store.google.com/us/product/chromecast_ethernet_adapter_gen_2

Milliways · Answer

The Ethernet ports on the Pi (and indeed almost ANY computer) are galvanically isolated so normally have to direct electrical connection to the Pi.
Ethernet DOES NOT provide any power.
Normally USB to Ethernet adapters require power FROM the USB port.
You can power the Raspberry Pi Zero over the USB-data port as it does not have any of the protection methods included in some other models. See https://raspberrypi.stackexchange.com/a/114381/8697
So assuming the USB to Ethernet adapter you are using PROVIDES power it would work, but as what you are proposing seems to have no source of power it is unlikely.

Can the Raspberry Pi work with Ethernet using a USB-Ethernet power adapter?

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