[ploxiln]

It's also worth mentioning that it uses the USB-CDC ("communications device class") standard driver, which is long supported/included in windows and linux and intended for use by arbitrary manufacturers.

The situation is not unlike that of usb keyboard/mice which use the HID ("human interface device") standard driver (which MCP2221 apparently also supports). So there won't be any argument or shenanigans about whether any third-party chip should be allowed to be compatible with this commonly available driver.