>How much money have you contributed back to this seemingly indispensable project?
Perhaps it's time for you to become familiar with the terms of the Mozilla Public License, under which Libre Office is released. There is no requirement for monetary compensation.
Yeah but like, we don't know if OP is making any money off this, let alone significant money. Let's not instantly hold them to the same "please contribute or you're dragging things down" standard as a zillion dollar corporation.
You believe you know better than the authors themselves about how they ought to be treated?
They chose -- explicitly, voluntarily, knowingly -- to give the thing away for free. That's their right for their own creation. Your preferences don't supersede theirs.
You've emphasized this point more than once, but I don't think it's a good counterargument to the GP. It is equally valid to say that they have explicitly (voluntarily, knowlingly) chosen to accept donations for their work.
By profiting off their work and not supporting them you are making your own choice. It says nothing about the authors' preference.
They chose a license that is _explicitly designed_ to allow people to profit from their work without paying.
There are many other licensing terms in common use. They chose that one.
That's fine, they can do what they like with their work. There is no moral obligation to reinterpret their motives in a fashion that differs from their formally expressed preferences.
They chose to accept donations -- also fine. If you want to donate, go ahead. If you don't -- that's fine too, by definition.
Perhaps it's time for you to become familiar with the terms of the Mozilla Public License, under which Libre Office is released. There is no requirement for monetary compensation.