It sounds to me like they are developing some tools to help map things inside the store. So they can give you directions to things you are looking for maybe. Also with this information they could do something similar to those Amazon stores where you just pick things up and walk out and it charges you automatically.

Not saying you all want to share the info with them. It is invasive. But as an engineer I can see so many cool features I could build with this information.

Junk email + VPN, but I've found that most free wifi services like this explicitly try to inhibit the functionality of mobile VPN clients.

People that make systems like these are not scared of those that stop using em. What they fear is getting information wrong or spam. Using these facts you can then adjust to the changes.

Temp-mail.org

This is messed up.

i'm pretty lucky to have unlimited data included with my phone plan. i would 100% have been hacked by now. public wifi is scary.

You can just make up some e-mail as, without internet, you couldn't verify it. Also one of the rare cases where VPN directly improve your privacy.