OneDrive
Microsoft seems to make more stupid decisions against its users than any other company of this size. Recently, however, Microsoft surpassed themselves, by slashing down the OneDrive capacity for every user. Now, the company has partly changed its mind and allows us to keep our free 15+15GB if we choose so.
Microsoft wants to promote its cloud service. That is why Windows 10 comes with OneDrive preinstalled, and without an obvious way to uninstall it. Fortunately, with some command line magic, we can completely uninstall OneDrive in Windows 10 Home and Pro, or just disable it in Windows 10 Pro.