If a recruiter attempts to add/move LinkedIn applicants, an error message displays in the Applicant Action Results pop-up to explain that they cannot be added/moved because they applied with LinkedIn.
Those who did not apply with Apply with LinkedIn (with Apply Starters) will be successfully moved or copied. You will see an error message for those who applied with Apply with LinkedIn (with Apply Starters).
Yes. You can still invite LinkedIn applicants to apply through the Apply Search Workflow.