Windows 10 will definitely update and reboot without the user taking any action.
One thing to remember is that many streamers are using dual-PC setups and the bigger streamers may only run these systems for streaming -- not for personal use.
It's very possible the streamer missed any update nags because they are mainly interfaced with the gaming PC.
And depending on their setup all the user input might be going to the gaming PC and the streaming PC might think it's currently inactive but with a pesky OBS process left running.
One thing to remember is that many streamers are using dual-PC setups and the bigger streamers may only run these systems for streaming -- not for personal use.
It's very possible the streamer missed any update nags because they are mainly interfaced with the gaming PC.
And depending on their setup all the user input might be going to the gaming PC and the streaming PC might think it's currently inactive but with a pesky OBS process left running.