Because this driver is often found on unofficial or community-hosted sites like Google Docs/Drive
Android requires specific kernel support for USB Ethernet. Most phones do not include these drivers. You would need a custom kernel or a rooted device with the appropriate module. Ff-usb 4 In 1-3 Driver
(such as those that allow PlayStation or Wii controllers to work on a PC) or multi-purpose USB-to-serial devices Because this driver is often found on unofficial
"Ff-usb 4 In 1-3 Driver" appears to be a specific legacy driver bundle often used for USB game controller adapters Ff-usb 4 In 1-3 Driver