Re: Let's step back for a second
"They do not need to take your passport, what the ruling obliges them to do is to ensure you have authenticated somehow in a way which ties you up to a traceable identity. That is technically trivial."
Wait, what? How exactly is any of that supposed to identify me "traceably"? First off, I have no Facebook account. I do have a Google account but all they have is my phone number. Which is a prepaid card, even if "they" could persuade Google to divulge it to them. And do please consider this is Eastern Europe I'm talking about, not the "how many Stingrays did you say you need?" USofA. Then again, I might decide to log in with a Google account that has not even that much on me. I hope you don't delude yourself thinking email accounts are "traceable". Our McDonalds tries to do something like that using a captive portal nagging you to "register" before you log in - which is not something I'd ever bother to do, they can shove their wifi where the sun don't shine.
You could ask me for my home ISP login credentials - which free wifi hotspots sprinkled around my town, run by my ISP already do - except I never log into any of those specifically because of that. It's none of their business what I do when I'm not at home (or even when I _am_ at home, but that's a different rant). Finally, if you seriously think I'd ever consider whipping out ANY sort of official document in a bar or restaurant to use their wifi... hahahahaha, think again.
Right now everyone is just printing their passwords (if they have one at all) on their menus here, and that won't change any time soon regardless of what gets ruled where. The only relevant piece of kit you'll find anywhere is the first bog standard off-the-shelf commercial router whoever they sent to go get some hardware could get their hands on. Yes, local authorities could push the issue if they wanted. Emphasis on "if they wanted". Specifically, on "_IF_". Do tell, what's in it for them? Yes, you got it, that's exactly how many shits they give.