We used to have this in the US city where I lived 25 years ago. The technology was different (DSL) but the idea was similar. I could get internet over DSL from any one of a dozen ISPs in my area, all run over the physical lines installed by the phone company. I picked a small ISP and they were great, low pings and technically competent help desk. At some point the phone company stopped allowing third party ISPs, I don't know what happened, why that stopped being a thing, but it was great while it lasted.
Today, my electricity is like this. I buy electricity from one of many different providers, all competing with different rate plans and gimmicks (free nights, free weekends, fixed rate, etc.). But there is one company that maintains the power delivery infrastructure.
"Well, social relevance is a schtick, like mysteries, social relevance, science fiction..." -- Art Spiegelman