I’ve seen a lot of comments from “postage police” and many others looking for any excuse to justify not registering a postcard.
Nowhere in the FAQs or Community Guidelines does it mention anything about “proper postage.” It clearly says all postcards must be registered, NO exceptions. So if anyone should be reported it should be those that state anywhere they won’t register postcards that don’t meet their personal approval.
What next? You’re going to refuse to register postcards without a postmark? I can’t tell you how many I receive without one. Upset about a pen cancellation? Those are legally legit no matter how much you may hate them.
Postcrossing isn’t designed for postcard collectors, much less for stamp collectors. There could be any number of reasons why you receive less or no postage than you think you deserve that isn’t due to fraud on the part of the sender.
Received a postcard? Register it. That plain and simple. Upset you didn’t get a stamp to add to your collection? Postcrossing may not be for you.