https://www.bleepingcomputer.com/news/microsoft/windows-10-limiting-the-bandwidth-used-by-windows-update/

When installing new updates via Windows Update or the Microsoft Store, Windows 10 can consume all of the available Internet bandwidth. A Windows 10 feature can allow you to specify how much Internet bandwidth these update processes can use so that it does not affect other programs.

With Windows updates ranging in sizes between 200MB and 500MB and feature updates, like the upcoming May 2020 Update, potentially being over 2GB, downloading them on slow or metered connections can quickly utilize all of a network's available Internet bandwidth.