In Kiev, I ordered an internet connection and to my surprise I was told that it was all done and ready to go without any visits to my apartment. I was surprised.
The wall outlet was an Ethernet port. No TV cable. No phone line. Direct RJ45.
Later I learned that everything is in the central wiring closet somewhere in the building. And many buildings are just connected roof to roof with cables.
I had 100/100 mbit connection, with unlimited data, for $15 USD/mo. Don’t remember having any issues. That was 5 years ago.
Back in the early days buildings often had their own LAN for sharing warez and gaming. Sometimes adjacent buildings were connected for extended network.