The only reason why open wi-fi is insecure is because of captive Wi-Fi portals and I'm not saying that the Wi-Fi itself or the internet access is insecure it's just that captive Wi-Fi portals are inherently insecure because they block secure http and also with the website you're going on to don't have https so you can easily figure out the password that they want you to enter in or be able to steal somebody else's session so you don't have to pay or you can just get into a Xfinity router or something