Starbucks Says It Will Ban People From Viewing Porn in Its Stores by 2019 November 29, 2018 https://gizmodo.com/starbucks-says-it-will-ban-people-from-viewing-porn-in-1830731785
Those filters they'll put are surely going to be effective, no way it's just another inconvenience for the user
You should be doing that even if you don't watch porn, when using public Wifi. Unless you watch a VERY specific type of porn and you think someone might be watching you
It's prudent to use VPNs whenever using public WiFi. Maybe the owner is snooping. Or maybe their security is weak, and someone else is snooping. You just never know.
I'll go one step further. My computers are firewalled in a way that there is NO way to connect outside of a designated tunnel, not even on my home LAN. I do them that way to try and keep my family members safe in spite of their poor habits. I only force them to one step VPN for their casual surfing habits.