English Opening : Bishop captures Knight on c3

It's okay for black, they destroy the white's normal pawn structure and the bishop's pair is not a panacea. Imho it's a wrong concept that the bishop's pair is always better.
It's okay for black, they destroy the white's normal pawn structure and the bishop's pair is not a panacea. Imho it's a wrong concept that the bishop's pair is always better.
My Knight at c3 is getting captured by black bishop often when i start with the English opening. Shortest variation is 1. c4 e5 2. Nc3 Bb4 3. g3 Bxc3.
What advantage black is getting here.? I also noticed some engines play this move. I don't see any advantage to black just to give away his black bishop that easily.