Why are you even in the library to begin with if you’re so opposed to how they manage their network?

How does one know how they manage their network before entering the library? The libraries that have ethernet /never/ advertise it. Only wi-fi is ever advertised. I have never seen a library elaborate on their wifi preconditions (which periodically change). This info is also not in OSMand, so if you are on the move and look for the closest library on the map, the map won’t be much help apart from a possible boolean for wifi. Some libraries have a captive portal and some do not. Among those with captive portals, some require a mobile phone with SMS verification and some do not. But for all of them, the brochure only shows the wifi symbol. You might say “call and ask”, but there are two problems with that: you need a phone with credit loaded. But even if you have that, it’s useful to know whether ethernet is available and the receptionist is unlikely to reliably have that info. Much easier to walk in and see the situation. Then when you ask what will be blocked after you get connected, that’s another futile effort that wastes time on the phone. It really is easier and faster to pop in and scope out the situation. Your device will gives reliable answers than the staff. But I have to wonder, what is your objection to entering a library to reliably discover how it’s managed in person?