You're entitled to nothing when authors write FOSS. They provide it as-is. Take it or leave it. No one is obligated to take support harassment.
The arguments left on GitHub are "well you chose this license" and generally, sure that's done out of good faith, but when organizations test the boundaries of an author's intent, they have no option but to relicense or dual-license.
And you know what, this isn't even unique! Tons of FOSS projects do not support alternative distributions. In fact, implicitly, virtually no one does. Most authors publish software with the expectation you'll use their distribution channels.