[hitpointdrew]

I don’t know what privacy you think you are gaining with your own modem.

They already have your name, address, and payment info.

If you are concerned about them seeing your traffic, well they are going to see that regardless if you use their modem or your own. They own the public IP you get assigned, all traffic is going through their route tables and equipment and is logged before it hits your home router.

Use DNS over https (not the ISPs DNS), or a VPN if you want to hide your activity from them.

Your own modem gains you little in privacy. At worst they could be tracking a count of your devices and their MAC address, but they probably don’t care to collect that.