1 c3 is better than it looks.
If 1.....e5 then 2 d4 exd4 3 Qxd4 Nc6 then 4 Qa4 or Qd3
Now have a Scandinavian with an extra move.
I have done well as Black with the Qd6 Scandinavian and expect even better with this.
If 1....Nf6 then 2 d4 g6 3 Nf3 Bg7 4 Bf4 0-0 5 h3 d6 6 e3 Nbd7 7 Be2 Re1? 8 Bh2 e5?
9 dxe5 dxe5 10 Nxe5 winning a pawn (If Nxe5 Qxd8)
Note Black should play 7....Qe8 if he follows with e5.
Also 8 0-0 is not good because after winning the pawn you need to play Nd2 then Nf3 to activate your queens side.
This is the London opening against the Kings Indian set up and I have done OK with it.
If 1.....d5 then 2 d4 and Black has to be careful not to play Bf5 or Bg4 too soon because of Qb3
White can either get the queens bishop out then e3 or if an early c5 from Black can play e3 (A reversed Slav with extra move).
The main advantages of 1 c3 are:
1. Opponent will underestimate it and you.
2. Good in rapid games (make him/her think).
It's winning, of course!
For black, possibly