Wifi question

I don't know if this belongs here, as it may be a networking question, but computers and networks go hand in hand, so i'll post it here.... My question is; why are the cable companies charging for wifi? It's a feature built into many routers and cable modems, and it generally is a network internal to the home, it doesn't go out on the web. Personally, i feel that it is a cash grab/ripoff perpetuated by the cable companies. The cable modem in my house has built in wifi, and is only on the 2.4g band. We were having issues a couple of years ago with the wifi part of it, so i went and bought a Netgear Nighthawk router. It has built in wifi that operates on both the 2.4g and the 5g bands. Most of the devices in the house are on the 5g band, as it is way less crowded, and our issues cleared up. The way i see it, people are being suckered into paying for a feature that is built in and free to use. Thanks in advance for your input!