Kiosks by definition don't alow users to modify the ui. they run in kiosk mode
There are kiosks used for public browsing, where the user has access to full browser app window and can change elements.
There are also ways to get around kiosk mode restrictions, or at least there were for Windows in kiosk mode back in the day. We used it to get browsing access or to just mess with the kiosk. The fun!
And that's probably by far the most value those kiosks ever provided to society - the chance of overriding whatever malicious, socially harmful marketing bullshit purpose they overtly served, and do something fun or useful with them instead.
Alas, opportunities like this are disappearing, as security maximalists are running the show in our industry these days.