In the UK, I have a "full fibre" provider (Hyperoptic) which pretty much exclusively serve apartment blocks. They run fibre to a switch they install in the building, and then ethernet cabling from that switch to every apartment. Targetting dense buildings I suspect gives them a really good cost/customer upfront ratio (in some cities they own their own fibre, in others they use other commercial providers, including Openreach which was spun out of the former state monopoly BT and has to provide fair rates to competitors). The latter seems like a reasonable trade off of government regulation and free market to encourage competition, I suspect the lobbying culture in the US wouldn't allow it though.