Still, I fail to see WHY Black should start with 1...c6 instead of the natural 1...d5. I can't think of a way to gain something.
Maybe they love the Caro-kann so much that they play c6 in the vague hope that their opponent will play 2. e4. Other than that yeah, kind of pointless lol.
EDIT: Thanks for the informative reply, forgot to add that
Because if not, c6 seems like a pretty viable response to d4 transposing into either a Caro-kann or Slav, both of which are very solid for black.