The point that I was trying to make was that it works out of the box, is Apple's official answer to "how do I do USB-C to Gigabit Ethernet without using Apple's Thunderbolt 1/2 to Gigabit Ethernet adapter and a Thunderbolt 2 to 3 adapter and without needing to install anything on either an Intel or an Apple Silicon Mac". It's not first party, but, like many Belkin adapters these days, Apple is directing people to it as though it was their own adapter.No it's not. It's a regular Realtek RTL8153 chipset which operates in ECM mode and is therefore as slow as all the other adapters with that chip (which are almost all USB-C Ethernet adapters out there). Apple has NO driver for that chip, and Realtek has only one for up to Catalina because Apple blocked the kernel APIs in Big Sur. They will probably never change the driver. It's simply not worth it for them. Compared to all devices out there, macOS is still a niche and the adapter still "works" in ECM mode.