Fela Kuti's Afrobeat was a mixture of Nigerian music and American Jazz and Funk, mixed with Nigerian politics. So who was appropriating what?
What does it matter that Kiri Te-Kanawa sang Mozart or Yo-Yo Ma plays Bach, or Howlin Wolf toured being backed by the (very white and very British) John Dummer Band?
Influences are good. Mozart and Muddy Waters had them. Take them from where ever you can, and make your music to the best of your ability.