When installing Crystal on macOS via the .pkg distributable:
This will install Crystal on your Mac.
This is a generic Omnibus welcome message. If you are building Mac OS X packages, you should generate a custom welcome file to suit your needs.
If you are not the creator of Crystal, the presence of this message is likely a bug and should be reported to the creator.
Similarly for the package's license:
All Rights Reserved
This is a generic Omnibus license file for Crystal. If you are building Mac OS X packages, you should generate a custom license file and description to suit your needs.
Bug Report
When installing Crystal on macOS via the .pkg distributable:
Similarly for the package's license: