Almost every café in Berlin that has wifi: Ask for the wiki password at the bar, or find it next to the menu card, or at some wall.

The only problem is that many cafés / bars don't provide wifi, because they are afraid of providing wifi at all due to the "Störerhaftung" (a legal issue that exists almost nowhere except in Germany). Luckily, there's Freifunk and VPNs to the rescue.

Starbucks in Canada: I just accept an agreement and it works. No login needed.

But that's because they can already track your identity by correlating purchases and wifi accesses.

If you pay with cash, how are they tracking your identity?

My point exactly. Not to mention you could just be in a car hacking away on their wifi.

A wifi mac address is probably traceable for the vast majority of users. I'm aware you can change them, but most people aren't.

Sure, copyright infringement proven by latte macchiato.

A) No. B) VPN