Not all Windows updates respect the download speed policy

Group Policy offers a policy to limit the BITS background transfer bandwidth. This used to be effective on Windows Update. A commenter on Super User noticed that, at least sometimes, Windows 10 doesn't respect that setting. For them, Windows Update did the download at the maximum possible speed. It's likely that the Creators Update was the item being downloaded, and they speculate that large updates like that one might be considered very important and deserving of fast download. I have no information yet one way or the other, but it does seem that Windows doesn't completely obey that setting for its updates.