Thanks for your report. We are aware of that. WinSCP is an open source software and its source code is available for free, e.g., on GitHub https://github.com/winscp/winscp
WE EXPLICITLY CANNOT RECOMMEND TO USE WINFTP PRO. There is no affiliation with WinSCP team, WinFTP Pro code is not public, we do not know what code version it is based on, what modifications have been done, what security flaws the software may potentially contain (or not). Also there is no contribution from NewEdge Software to WinSCP.
It indeed looks like it is a NewEdge Software business model to "take open source software and sell it" (see their other software in the store).
The first version they have released some time ago clearly violated some copyrights. We asked Microsoft then to take it down based on those violations. But recently they have released a new version that "resolved" the reported problems.
We will consider to report the actual WinFTP Pro version, however for now we prefer to spend our limited resources to make WinSCP better, instead of spending them on this issue.