Mongoose is a publishing company - not a software company.
Problem is support - software doesn't just 'work' in the wild like books do... books can have all sorts of flaws (and do), but still be 'useable' - software flaws and just unaccounted for differences between user setups can make a product unusable more frequently than a book is physically damaged.
That is also assuming Mongoose has or can get licensing rights from FFE.
There is also the business aspect. For instance, chargen for the base careers is largely missing in the open content - you need to buy a book. With a program, you don't for chargen - which is over 10% of the missing content in the SRD (good luck with that 'argument' apoc527

). Software is also easily copied.
Since right after my first two games in the '80s, I've never played Traveller without using a computer for these chores. Fact is, with a good program there isn't much need for any books.
Book sales, piracy and copyright aside, there is also the issue of implied support - i.e. when the program fails to match the books and the book publisher gets blamed.
Software could cost Mongoose not only real dollars, but image and customers - I'm sure they are aware of this. At some point, I would suspect they will figure its not significant enough to worry about, and if they have the license rights, condone anyone sharing software for free.
Either way - doesn't hurt to ask!
Matt and Mongoose seem very approachable and definitely aren't some faceless company just looking to make a buck - they are fans of their own work and it shows.