Rape is an instrument of war. I cannot think of a war where it has not been used. I reckon it's less abele to be used in Ukraine purely because women and children were generally evacuated, because there are certainly reports of horrific rapes in villages that were invaded.
Sudan is utterly horrific. We know why we're not hearing about it. This doesn't even need pontification. It's the flip side of why we hear about Ukraine.
As for Israel, that raises something else related. The rape and sexual humiliation of men is also a weapon of war. I do not know if it's as widespread as rape of women. I think not quite, but it's definitely present. While there are cultural ramifications in Sudan and other countries on women being raped, it's at least acknowledged. But when men are raped they often don't/cant talk about it for different but at least as strong cultural reasons.
So we see in Israeli detention camps men have been raped (by objects) and raped to death in at least one case. While the "system" apparently went to punish the perpetrator (and I'm suspicious that only ONE soldier was involved), people were protesting his arrest. In Russian prisons, male rape (using objects) is known to occur. It's used in many other prison systems.
Basically, when men are given the power of free rein over others, know that they can get away with whatever they want, many sadly use it to sexually torture, be it rape or in other ways (Abu Ghraib) those under them.
The Hamas rapes I'm sure happened. I believe some women hostages would have been raped too, not because it was Hamas, but because it ALWAYS happens. It's not that every man would do it. It's that enough men worldwide either participate with, or stand by the ones who want to do it, when they think they can get away with it.
So Sudan is a situation where certain men are running wild. Where filming on phones is almost impossible so they're really "free". It's absolutely no shock that it's happening.
What's shocking is that we still think of rape as isolated incidents and that in wars it's one of the last things to be reported when it's THE greatest risk to civilian women and girls. And any captive, male or female, is at high risk too, albeit for slightly different reasons.
War = rape. Always has, and at the moment, always will.