Sure, there might be a way to change your workflow and never ever open a secret file with those editors, but my point is that a software that sends your data without your consent, and without giving you the tools to audit it, is a no go for many companies, including mine.
Too many vibe coders contribute trash code if any. They need more code from so called experts that isn't open source yet.
So, for example, if your local `.env` is inadvertently sent to Cursor and it's persisted on their end (which you can't verify one way or the other), an attacker targeting Cursor's infrastructure could potentially compromise it.