> and why wouldn’t someone like the NHS not already be using this?

We all say "The NHS", but it's made up of a bunch of different companies.

https://www.nhsconfed.org/resources/key-statistics-on-the-nh...

    135 acute non-specialist trusts (including 84 foundation trusts)
    17 acute specialist trusts (including 16 foundation trusts)
    54 mental health trusts (including 42 foundation trusts) 
    35 community providers (11 NHS trusts, 6 foundation trusts, 17 social enterprises and 1 limited company)
    10 ambulance trusts (including 5 foundation trusts)11
    7,454 GP practices12
    853 for-profit and not-for-profit independent sector organisations, providing care to NHS patients from 7,331 locations13