Who is calling it a new phenomenon? The only thing new about it is the name.
I personally think that things are too "hot" right now, but nobody should pretend this is a modern problem.
Untold Black American artists, authors, and creatives who fled to Europe: Nina Simone, James Baldwin, Josephine Baker, Paul Robeson, Augusta Savage, Romare Bearden, Jessie Fauset, and Richard Wright just off the top of my head.