Ben80
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Firstly, because the Heroes of Might and Magic III source code is a very powerful base for any kind of cheating. And, I believe, its openness makes all the work on features for fair play, like password-protected saves, pointless.
(Although, of course, there is already plenty of room for cheating here.)
Secondly, Heroes of Might and Magic III contains code or developments from other developers who, for one reason or another, absolutely do not want them to be made public.
Thirdly, the author of Heroes of Might and Magic III is greedy for fame.
And finally, the author now receives financial benefits from the project, and there are not many options here.
Why not at least open up the bug fixes for the game? After all, this is essentially very important information for the community. At least put it on GitHub; those who have bug fixes (or, more precisely, fixes for what this developer considers a bug) could upload everything. I personally am ready to upload mine. But if others, especially baratorch (at least the code that he is not obligated to share with other very closed developers), also uploaded their fixes, then I would be much more willing to do so as well. However, I am already ready to provide the available source code for Heroes of Might and Magic III bugs to anyone who requests it.