Can a migrated question be removed without any harm for the new message in another forum? Does it serve as a link only or is there a deeper connection between the original and the migrated question? I just would like to remove the link and want to know if it is safe.
Yes, you can delete the stubs for questions that have been migrated to other sites. They're just there as a convenience redirection for the asker and anyone else who might not know the question has been migrated to another site.