Why suddenly giving 100% of Britain 100mbs BB wont do much for the national productivity. That money would be better spent else where, better vocational train

Why suddenly giving 100% of Britain 100mbs BB wont do much for the national productivity. That money would be better spent else where, better vocational training - Rebuilding the countries ability to say be able to make its own pistol or rifle Can you see the spending round where the Postmaster General competing against the other departments for more funding for police or the NHS vs subsidising BB.