Countries don’t really care about Gaza either, they care about Israel and because they care about Israel there is a counter-movement to care about Gaza, some of it financed by geopolitics, which makes it into the news cycle.

Imperialism, or a sternly worded letter? Choose your preference. The UN is present and has condemned what is happening in Sudan, and this article literally cites them as a source. Presumably they are no one, so no one cares.