Well, if you think of it as an FTP client. But it’s a multi-protocol file transfer client; I mentioned that the list of protocols was short on the iOS version, but it still includes three options that don’t have “FTP” in their name.

I know what you’re saying wrt “wouldn’t occur to anyone to do” - true, desktop file transfer apps don’t traditionally include dedicated SMB support, since the OS can handle it. But the idea did occur to the developers of multiple competing iOS apps, including the one I mentioned, which support SMB in addition to FTP, WebDAV, and various cloud services.

(FWIW, I’m not claiming I was scammed or anything like that. The feature list was right there in the App Store description, and even after buying the app I could have tried to get a refund. I didn’t, because I have use cases for it other than SMB. I’m just surprised that it’s missing.)