AirDropの主催者がどこまでチェックしているか次第なので、一概にはなんとも言えないですね。
無難に鍵のないアカウントを使う方が良いと思います。
AirDropによっては、ハッシュタグ付きのツイートへのリンクを求めてくることもあり、そういった場合は間違いなく鍵垢ではダメだと思います。
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