This pawn sacrifice is not considered dangerous in the normal lines with 8. ..0-0.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3  4... f8b4  5. c1d2  5... b4e7  6. f1g2  6... c7c6  7. d1c2  7... b7b6  8. e1g1  8... b8d7 Black decides to postpone castling and this can lead to original play.