I don't think "idiot" is excessive. Prosaic, fine.
About 14 months ago, Evernote Corporation pushed its users to new software which was, by its own description at the time, beta.
Beta does not mean "ready for general consumption". Beta means "probably still a little buggy, but basic functionality is there, and if you want to try some shiny new features, here you go".
Ctrl+C functionality was broken at the time. IMO, having such basic, essential functionality broken might be expected under an alpha release, but not a beta.
Millions of people around the world use Ctrl+C multiple times a day.
14 months have passed. The "beta" descriptor is gone from the new interface.
Ctrl+C is still broken.
If you have a single credible reason to break Ctrl+C functionality in a text editor, please share. Everything points to a complete, utter failure of Evernote UX and QA. But hey, at this point, I'm just yelling into the ether. I don't think Evernote Corp cares.
If Evernote Corp had gone "whoopsie, we should have fixed that before the beta", I might have understood. However, the fact that they have left a very common, everyday keyboard shortcut broken for 14 months and counting speaks to a total lack of care for the end user.
What can I say? Keep your data backed up.