You can apply a Registry tweak to prevent Windows 10 from downloading and installing suggested apps.
It happens to both local accounts and Microsoft accounts. Once you connect your PC to the Internet, the operating system will start to download them. Windows 10 shows no confirmation when installing suggested apps. Without the user permission, Windows 10 installs suggested apps like Candy Crush Soda Saga, Minecraft: Windows 10 edition, Flipboard, Twitter, Netflix, Pandora, World of Tanks: Blitz etc.
Starting with Windows 10 Anniversary Update, the operating system automatically downloads and installs apps and games.