BT is not a monopoly
The government disagrees - Openreach is very much a monopoly (even in areas with Virgin, there is no other open access operator), though BT Wholesale is in some areas and BT Retail isn't at all.
and hasn't been since the mid-80s regardless of what others seem to mistakenly seem to believe so there is nothing stopping others setting up their stall in any part of the UK, instead they have tended to cherry pick and only operate where they feel they can make a profit. Why should BT be any different? It is also my understanding that BDUK money has mainly been used to gap fund upgrades rather than pay the entire cost.
Because BT is unique in that it has the duct and pole network, and (currently) is allowed to ensure that no one other than BT is allowed to put cables in or on them. It is simply ludicrous to assume that every operator must undertake an extremely time consuming, costly and risky overlay of that infrastructure from scratch. The cable companies tried; they all went bust - it took decades of bankruptcy, mergers and licking wounds for its successor to try again in any meaningful scale. Look at the US, where they expect new entrants to do just that. They've ended up with a situation where city governments are pleading with Google and their enormous pockets to step in and break the real monopoly/duopoly.
BT also receives enormous incomes from its position as the monopoly infraco, making money regardless of who the end user chooses for their provider. They are also the largest recipient of taxpayer money for "rural" broadband rollouts. That is why BT is expected to act differently to any other operator. The same reason why Royal Mail has to deliver to every house in the country, for example.
Countries that once looked to the UK for tips on how to wrangle their incumbent telco (NZ, most notably - even going as far as hiring a BT exec to run their telco), have now surpassed us - they're well on the way to a proper fibre network, while we stick with antiquated copper bodges that will cost more for BT in the long run, while holding the country back for another decade
Edited by deleted (Tue 22-Mar-16 20:38:22)