Just bought a UGreen USB 2.0 to RJ45, that has the AX88772 chipset. This works fine. Just plugged it in and Network under Settings showed a choice of Wired or Wireless. Clicked on Wired to select. A little bit of a shame that you can't fix the IP address but it all works nonetheless.
Not according to their support page. I used one of the recommended 10/100 adapters and that works fine. I get download speeds of 90 Mbps with the adaptor. It would have been nice to be able to use a 10/100/1000 adaptor but it does not work.
Why don't you support gigabit ethernet adapters? It's 2021! Are you that cheap your hardware won't support faster adapters? I can understand on a stick due to limited space and power but this is a large devices not relying on USB power. At least add WiFi 6 chips to your devices. Don't become Apple and sell old devices like they're modern.