If a person is born & raised in one country, becomes a citizen of another country & plays sports representing his new country, is he a traitor to his people or not?

SpaceGalaxy
Example: Born in Turkey, lived there until late teens, moved to Germany, became a German citizen and now play for Germany even if they play against Turkey... If you were a Turk, would you consider him a traitor?
If a person is born & raised in one country, becomes a citizen of another country & plays sports representing his new country, is he a traitor to his people or not?
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