Wi-Fi Sense is enabled by default by default in Windows 10. It sends encrypted passwords to your contacts, who can connect to any wifi network that you have the password to. Windows 10 keeps your saved passwords when you upgrade, so all the networks youve previously connected to are shared by default. Its also a huge security fuckup waiting to happen, and you can bet that an intrepid hacker will get at it. To disable the feature, uncheck basically all the boxes you can see.”]
Source: https://gizmodo.com/why-the-hell-is-windows-10-sharing-my-wi-fi-passwords-1719900675