@metin This is just FUD.

The “Open” entry from the context menu no longer works on #macOS Sequoia but there are at least three solutions:
- Go to System Settings->Security and allow the app (recommended alternative)
- self-sign all your unsigned applications (geeky alternative)
- disable the check from the command-line (insecure alternative).

In all cases, this achieves what #apple intended: the end-user has to somehow manually allow an unsigned app to run in full awareness.