If you are uncomfortable with the setting, Microsoft makes it rather easy to control. Or perhaps more safely, this has not been demonstrated to our knowledge. Microsoft is not commandeering your network akin to a Torrent, swallowing up massive amounts of bandwidth in an all-they-can-get manner. For most users with a home connection, this feature does not matter. Microsoft is pretty forward with this information detailing it in their FAQ on the subject, which is also linked in Settings.
The data is siloed, and there are only shared bits, not whole services or updates.
There is no security concern here, to our knowledge. PCs on the Internet – Although it is one thing to share with computers on your network, you are also possibly sharing bits of updates (not the whole thing) to other PCs on the internet.
Windows Update Delivery Optimization is on by default – If you did Express Settings during the Windows 10 setup, you agreed to have this feature enabled The idea is a very good one, but there are two concerns: It also helps Microsoft by offloading some of their bandwidth and reaching more customers quickly. The idea here is for distributed Store and Windows Updates, which helps you with faster, more reliable downloads.
Delivery Optimization also sends updates and apps from your PC to other PCs on your local network or PCs on the Internet." And if you own more than one PC, it can reduce the amount of Internet bandwidth needed to keep all of your PCs up-to-date. "This can help you get updates and apps more quickly if you have a limited or unreliable Internet connection. Microsoft explains the reasons for this feature in their detailed FAQ on the technology: The feature "lets you get Windows updates and Windows Store apps from sources in addition to Microsoft". One new feature in Windows 10 is Windows Update Delivery Optimization. However, there are still parts of the world where there are monthly data caps for various internet connections, and this could cause problems with Windows 10. When it comes to internet data many users, especially in the US, enjoy unlimited data at home. Windows 10 brings with it many new features and some old ones just moved around.