I thought I would set up a new node using Cafe/restaurant WiFi as an experiment. Some Cafes block Bitcoin, but the one I'm in at the moment seems toi support Core. The one I am using at the moment has a link speed of 173/173 mBits. Core is stating that it will take 13 weeks to complete, and that is with a 24 hour connection. Obviously it will take far longer with intermittent connections. I can see me getting bored in a few days, and I may scrounge a cable connection to speed things up. I'll try to resist this, and keep this as a digital nomad project.
I think it's not advisable to use a public wifi downloading the blockchain because of some risk. Public wifi networks are typically unsecured and can be easily compromised by hackers who may intercept your connection and steal your private information.
Downloading the blockchain isa resource-intensive process that requires a lot of bandwidth and time. Doing so over a public WiFi network increases the chances of the download getting interrupted, resulting in wasted time and bandwidth. and also could potentially violate the network's terms and service, which could lead to legal consequences.