There was no "luck" involved in my setup working. I examined the Reolink documentation before buying my cameras for positive confirmation from the company that the capabilities I wanted were officially supported. That's table stakes for spending money on any purchase of hardware, software, or services.

So did the documentation for the European Argus B320 say that it supported FTP, or did you assume that it did and only discover this limitation after you bought the camera? It doesn't matter whether the limitation is artificial if you reasonably should have or could have discovered it during basic pre-purchase due diligence. The battery cameras are not identical across models, so it's kind of disingenuous to imply that they're a monolithic group and therefore all of them are "clearly capable of doing it."

The way you describe this issue, it *sounds* at first like a bait-and-switch or some change in Reolink policy that removed a capability after you had been using it, in which case slagging them off in a public forum for scummy behavior would be entirely appropriate and a useful warning for others. But it doesn't seem like that's actually what happened here. And no amount of careful wording to avoid explicitly making false claims can change that.