You can. But it then has to route through their modem+router single piece unit.
E.g. I have my own router which handles everything I need. But I switched ISPs recently to save 70$ per month, and the new company router has parts of its functionality, like turning off the wifi, built into their smartphone app and disabled in the admin panel.
Also the username and password for the unit is, by default, admin/admin. In 2023.
It's mostly due to early "archeologists" being almost entirely trust fund babies born into the aristocracy and to whom it was a contest to make the craziest claims possible.
See the OG trench at Troy that went completely past the end of the Bronze Age and dumped all of the important artifacts into a refuse pile that is apparently still being sifted through today.
Also see early "paleontologists" who seemed to use Dino bones in an attempt to make monsters scary enough to make kids cry.
Truth be told I have a Motorola Droid running Android 1 and if all you need is a phone with some email and sms texting it works fantastic. Even has a physical keyboard.
Looks at how Canadian ISPs led the world in early internet technology then once privatized, ignored it and allowed Nortel to be infiltrated and shut down by CCP spies, allowing then to steal 5G technology.
Hell, in Vancouver you have the private Canada /RAV line, and the public Skytrain line. One was built in the 1980s and isn't at capacity yet and the private one was finished in 2008 and is already over capacity.
Yeah there really is 0 comparison between public and private.