If this sounds like your week
A clipboard manager sees everything you copy. That's the risk.
Passwords, API keys, client data, private messages — it all passes through the clipboard. Plenty of clipboard tools sync that history to the cloud or phone home with telemetry, which is exactly what you don't want for the most sensitive stream of text on your machine.
Where tooling usually breaks
Convenience shouldn't mean uploading your secrets.
A cloud-synced clipboard turns a local convenience into a data-exfiltration surface. And a manager that happily indexes whatever your password manager copies is keeping the one thing it absolutely should not.