The New York Times recently had a column on the safety risks of using free wifi kiosks in NYC. If you read the column, you may come away with the impression that there are a lot of privacy options, even though the writer acknowledges:
Even with all the safeguards in place, it is a good idea to treat the LinkNYC kiosks as you would any public network anywhere in the world. Do not log in to sites that store your financial information, do not enter your credit card number into any web forms and stay aware of others on the street who may be playing close attention to your online activity.
In other words, if you use it, assume you’re broadcasting your personal information to the world.
And if you hadn’t read it already, read Joe Cadillic’s post, “10K Google Wi-Fi kiosks are collecting millions of faces and MAC addresses.”