no company will provide any info of possible exchanges pre ico. Several things could go wrong post ico and if investors feel jaded that a promise wasn't delivered, it could really impact the company's reputation
Actually some compaines are doing that. But you're right it's risky.
About vibehub it already reached 4600 eth, so exchange won't be a shitty one.
That's quite a good amount so far. Much lower than the max cap of 115000 ETH though - if it ever got closer to the cap, that would be a guaranteed acceptance on any exchanges of their choosing.
Exchanges are the most unimportant in the development process. Its only important for standard cryptocurrencies, not for projects with a real market usecase (Unless you are a trader).
I don't understand it either why a exchange that will list the token right after the ICO is so important for a lot of people. Are they all interested in selling their tokens after the ICO with a profit? If you are truely convinced about the project you won't sell asap but HODL and watch the project grow.