I wonder if a modem is required to be programmed when using with an internet provider? If yes, what is the purpose of programming a modem?

Do both a DSL and a cable ISP both require a modem to be used in an individual home?

For example, I have a Motorola modem

SURFboard Model:SB5101, 
Customer S/N: xxx
S/N? xxx
HFC MAC ID: xxx
USB CPE MAC ID: xxx

a coil of cable and a splitter from Comcast High-Speed internet Self-Installation Kit, which were bought 5 years ago, when I purchased Comcast internet service from its retailer www.comcastoffers.com. With them, I was hoping to reduce the amount of fee by avoiding to ask Comcast people to come over to install. But I remember at that time Comcast sent its technician here, dismissed my idea of self-installation, saying they needed to use their own modem and charging me a hefty fee, and so my equipments have never been used.

I haven't been using Comcast for a long time. I wonder if my modem, cable and splitter (brand new, never used) are still good to use with an internet provider such as Comcast? If needed, we can ignore their policy and just consider the technology side?

Or they are not good to use and I must throw them away like trash?

Thanks and regards!