I agree with some of what you said, Tony. That doesn't mean you are wrong, or that I am right, it means we are different and that is a good thing. We all have to find what works for us as individuals.
I wouldn't reveal my real ID to anyone I have not met in person, face to face. Therefore I don't think it is fair of me to ask anyone else to reveal their personal info online to a prospective partner. Making a simple sign with a "Hi Tony I am bluemoon232" in front of you while on video suffices to prove you have a real person, not a virtual reality (VR) software image in the video. I believe that if someone asked me for real ID info before we met in person (even without name or ID #'s) it would scare me into thinking this person was after my identity, or to impersonate me somehow.
If you get to the point of meeting someone face to face and in person, then get their real name and if you have to do background checks, or whatever "due diligence" you need to do to make yourself happy. it just isn't worth it until after you have spent a week or more together side by side and see if it might work to do anything else, IMO.
While you might be on to something with National Anthems, well known information, etc part of your statement I think that in itself is very broad to assume everyone knows stuff like that. I think it is on track with the right ideas, but may need adjusting for individuals.
Your statement about the culture(s) is 100% accurate. For instance- My wife's family of origin lives on a remote island in the Philippines. They have internet access, but zero television reception and at best spotty radio communications. They don't really know much of what is going on in the rest of the world, only what is in front of them. There have only recently ( in the past 2 or 3 decades) been schools there, and since it is an agricultural community most kids work on family farms and are home schooled (if any). therefore they know practically nothing about National interests. They did know about the new President and voted in the last elections.
. ...Ask for the person in question to A) hold an official form of ID and covering personal information but clearly showing the State/Country of Issue and the Photo, snap a picture and send. and/or B) a recent Utility bill i.e. electric, gas, water with Street name & number and Account number "covered" , but showing the Date, persons First Name, City, State, Country ... Snap a picture and send. Just think about it for a moment ...
If you will be on " instant messenger or chat" with someone in another country and have " doubts ", ask a question about the country that should be able to be answered immediately without hesitation - Be sure that YOU know the answer FIRST i.e. What is your National Anthem and give me the first line. It's doubtful that some scammer in Lagos will be able to recite Deutschland Uber Alles or My Country tis of Thee on demand. And, for what it's worth, if in contact with someone in a foreign country remember that " customs" are different. What's OK in the USA may not be in ... Example, don't send pics of or if on video, make the American hand gesture A-OK to a Russian or Middle Eastern. If you are a Texas Aggie fan don't flash the Horns to an Italian... If you are interested enough in someone in another country, take a few and learn about their culture. Its actually interesting.