Australia and the UK both have a similar business environment to the Swiss model (but without the superior bandwidth) due to the way that their government-owned telephone monopolies were privatised: Telecom Australia (now called Telstra) and British Telecom (now called BT) were required to allow their newly-formed competitors to sell services over their networks (for appropriate maintenance fees, of course).

The US and German models are consequences of just yelling 'Free market!' without stopping to think about what's actually being sold in that market, and how to encourage genuine competition.

Australia is still pretty messy, Telstra was privatised and pretty much stopped upgrading their network for years around the 24 mb ADSL level

Eventually we had a forward thinking prime Minister create a new company that started running fibre to homes and wholesaling it to non government businesses but they lost power and fibre to the home became fibre to the neighbourhood running the last bit over existing phone lines

Eventually it was returned to fibre to the home as upgrading existing lines to run shitty 100mb connections was actually much more expensive than just running fibre

We're only now starting to get to the point where fibre is fairly available when it could have been ten years ago