I mean, yes, unironically. If the goal of a prediction market is to find out the truth about the world, that's what will get you there faster.
Google might feel differently about whether it's OK in that case, but that's their prerogative.
Ask yourself: If the CIA really needed to know in advance what the top search result was going to be with as much accuracy as possible (for some weird reason, doesn't matter why), how would they go about doing it? Would they spend a bunch of time evaluating all of the public information, or would they just bribe (or otherwise convince) an insider at Google to tell them?
