Public Wi-Fi is still the biggest security risk most people will stumble upon. Having all your traffic sniffed leaves you hoping that every website you go to with an account didn't screw up....like they all seem to do over and over.

That non-https secret hashed address link doesn't do much good if some meth head with a laptop is sniffing all the Wifi traffic. On someone else's Wifi, your chances of using DoH successfully is pretty low. Why have an open Wifi, if you aren't blocking all DoH and DNS, so you can funnel all through your own DNS and collected massive sensitive user data! The opportunities on an open-Wifi are abundant for reset tricks, HTTPS downgrade attacks, MiM stuffy stuffs...

Then, devices leak more information than ever about you! They run so very many useless services you'll never use, by default! Bonjour!

You must trust the open Wifi operator 100%, because they have you by the ball bearings! They can MiM all your crap, record everything, and profile you better than a Amazon, Cloudflair, and Google tag-teaming your Mom's every online usage into a virtual profile with the Internet security breaking side-channel attack of a Cloudflair DDoS protection Recaptcha box.

You are also at the mercy of targeted attacks as well, while on that Road Warrior network. Time to spray your teeth with silver paint and get crazy!

I'd say, at least use a junk VPN or proxy, if you are to use such an insecure party line as an Open Wifi.