The only reason public Wi-Fi is a thing in this day and age is marketing & advertising tracking. Venues don't deploy it out of the goodness of their hearts, they do so because the data they collect from it exceeds the cost of deploying and operating it.
Another issue is that most public Wi-Fi is provided by a few companies offering it "as a service" to the venue so these companies can track you across different venues by your MAC address.
Trading off mobile data for public Wi-Fi for "privacy" is stupid and counter-productive. You're trading off a company that might occasionally be nasty (depends on the region - carriers selling granular location data like in the US wouldn't fly in Europe for example) to companies whose entire businesses is to be nasty.
The only reason public Wi-Fi is a thing in this day and age is marketing & advertising tracking. Venues don't deploy it out of the goodness of their hearts, they do so because the data they collect from it exceeds the cost of deploying and operating it.
Another issue is that most public Wi-Fi is provided by a few companies offering it "as a service" to the venue so these companies can track you across different venues by your MAC address.
Trading off mobile data for public Wi-Fi for "privacy" is stupid and counter-productive. You're trading off a company that might occasionally be nasty (depends on the region - carriers selling granular location data like in the US wouldn't fly in Europe for example) to companies whose entire businesses is to be nasty.