It would also be a huge discrimination problem.

I (as part of a small team) run the IT side of exams for a UK University and as well as the many exams intended to be taken entirely with computers, we also deliberately have an exam that's always marked as "Available to take" regardless of where on campus you are and what machine you're using, that exam just launches a stripped down Microsoft Word, with no way to start other software or access your own data.

So instead of reading the instruction book and writing either in the book or on separate provided paper, you read the book and type your answers in Word, when you're done either your work is printed or these days often it's automatically sent to the markers electronically.

There's a spectrum of people using this, going from the profoundly blind who couldn't have attempted an actual hand written exam through to people who have dyslexia or similar problems and would be able to write but it might be very difficult to mark. It also becomes a "last ditch fallback" for a number of scenarios where plans went wrong or something was forgotten and so that's why it's always available - we do run exams specifically planned to be in Word, but those have distinct IDs so that you know you're taking the exam "HIST1234/C4 History of Clowns and Clowning. Essay on prepared topic" or whatever, as well as "Multiple choice" style exams, and a large number of exams which involve using computer tooling, e.g. R, Stats packages, programming.