[ocdtrekkie]

This is also not true as of Windows 10 build 16299/Fall Creator's Update (what I'm currently using), and may not be true of an earlier release or two. Ctrl+C and Ctrl+V both work just fine in cmd. I found evidence it was considered an "experimental feature" available in the Command Prompt's Properties dialogue back in 2015, it looks like it's been folded into the default behavior at this point.

Microsoft's done a lot of work on legacy components of Windows like cmd and notepad in the last few years, assumptions about behavior that has worked the same for the last twenty years may no longer be valid. ;)