That would probably be very effective so I think there's a good chance Google does take that step at some point. The only reason they might not is that it looks

That would probably be very effective so I think there's a good chance Google does take that step at some point. The only reason they might not is that it looks extremely anti-competitive to leverage their search monopoly in that way, but we all know how lax enforcement is in that area these days so I would be surprised if that stopped them.