Every major cellular carrier has begun offering unlimited data plans. Using your phone’s hotspot to connect your iPad to the internet is more secure, less hassle than publicly available WiFi. Using WiFi in a hotel, airport, park or caf is like an invitation to getting hacked because: You’re not sure who’s running that WiFi service. You’re sharing the WiFi connection, and thus the speed, with anyone else using it. Using a VPN “client” will protect you from insecure networks by putting up a barrier between you and the network.”]
Source: https://www.csoonline.com/article/3179747/is-your-familys-cybersecurity-worth-20-a-month.html