True but the driver before the world wide web would have been cable TV over fibre to the home.
She decided it was better to open the market to foreign cable TV providers and so barred BT from selling TV access.
Without TV there was no driver for fibre investment.
Where BT would have had a requirement to provide universal access to fibre, as with phone provision, Telewest and NTL just did geograhically limited roll outs of legacy coax and the rest is history.