Taking the pawn on d6 doesn't help White either.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. f2f3 One of the most aggressive variations to face the Nimzo-Indian Defense. 4... c7c5 This is a very popular move these days, although there is nothing wrong with the old 5...d5 move. 5. d4d5  5... d7d6  6. e2e4  6... e8g8  7. c1f4 A strange new move, which immediately leads to trouble for White. It's hard to say why Nepomniachtchi chose it. 7... f8e8  8. d5e6 Another compromising move. 8... c8e6 