I love this presentation by a Microsoft person on the security aspects of the Xbox One: https://www.youtube.com/watch?v=U7VwtOrwceo

Perhaps it's just that xbox is irrelevant, when you have PC and Playstation?

To me, Xbox is that video-game you get when you ask for a Playstation and your parents don't understand video-games. Their versioning scheme even helps make sure the parents fail to purchase the latest generation.

The two main things that people jailbreak consoles for are dumping games to emulate on PC and running homebrew. Microsoft explicitly supports the latter use case with Dev mode and for all but a couple games (only Halo 5 nowadays?) explicitly supports the former use case by releasing their games on Steam and skipping the emulation bits. So there is little interest in hacking the Xbox consoles now. Yet I think someone still has managed in the past year to get decrypted game dumps from both XOne and Series X.

there has been one recently that led to the dumping of games on xbox one and série and the beginning of emulation projects

To be fair, it has no games either.

people lost interest in hacking the xbox after dev mode was introduced to run custom apps