To be honest, there are certain risks when you are using free connections. One reason is that you don’t have any knowledge about the type of network or any safeguard mechanisms that may or may not be in place.
Secondly, due to technical interruptions and viruses, having an open internet connection can also question the privacy and data of your device.
There are certain mechanisms in place through which you can ensure you are connecting to a safe network. You can also take the help of some professionals to know more about this process.
Nevertheless, there are very few chances that such occurrence might be there, so generally, there is nothing to worry about.