In my market you can’t plug into the ONT because it still requires authentication. The modem the ISP provides has hard coded settings to limit connection count

In my market you can’t plug into the ONT because it still requires authentication. The modem the ISP provides has hard coded settings to limit connection counts as well as rate limit and probably other things. There is a reason they sell full duplex gigabit for so cheap, there are gremlins in the hardware.