and partially because the developers are insufferable dickholes.
Is that guy an official developer? It looks like he’s just a developer of one of the add-ons, but I haven’t deeply researched this. Gross behaviour nevertheless and seems to stem from a misunderstanding of what a FOSS license means.
EDIT: I see what you mean in this thread: community.home-assistant.io/t/…/33, although that was a couple of years ago so maybe things have cooled off a bit.