I initially wrote a much longer comment, detailing multiple instances like these from just the past few months. But then I just deleted it because it will be too long.
As for them - They will just tell "huh, he is hacker and can send fake emails from fake non-existing platforms".
It's like me attempting to demonstrate my possession of a private key for an SSL certificate to someone who lacks even a basic understanding of what a "browser" is, or who has never encountered terms like HTTP or HTTPS.
Another thought, more closely aligned with the original poster's point: if someone pushes to transition everything to a digital format, he must first understand what that means. For instance, if you're looking to gather email addresses, take the time to familiarize yourself with relevant RFCs. Understand that the local part of the email is determined by the user, not you. So, if I decide my email address should be "john with space here-doe!@#$%^&"@example.international, and I've set up my server to accept messages directed to this address, and given that IANA recognizes ".international" as a valid TLD, then it's a legitimate email. For clarity's sake, my actual email is of the format first.last@example.international, without any "non-standard" characters.
And as a connection to the OP - they are pushing for debit/credit cards society and when they make sure that all your money are with them and you don't have a single cent on you - they just cut you because you're just 0.001% and an edge case. But that is their point of view. From your point of view its like this:
At home if my card stops working i can go to my bank the very next day and get it sorted. I can walk for 15 minutes and be at my mom's place where I can eat everything for free.
The next day you are in another country where you don't know anybody and if your card stops there, they just leave you to the wolves.
For them you're the edge case - 0.001%. For you - this is all your food, shelter, health. It feels a bit unfair.