seems not very useful looking from the reputation of coinsbit a little bad in bitcointalk. they do free airdrop in the form of CNB (worth 500$) in my opinion it's already too excessive especially from what I hear they also ask to complete KYC to get free airdrop. the problem is his reputation is bad.
i think they already doing the right thing to ask KYC because the amount is pretty high around 200~500$.
about the exchange reputation, can you share the thread link? because i thought that this exchange is a relative new?
but there is no guarantee that the CNB token later when sold will be worth the initial estimate (200-500$), it could be later when the CNB/BTC pair market opens next year (available) will only get a value of less than 10$, no one knows that. that the estimate price is just like speculation, as far I know CNB token no have market yet.
You should read the post on the first page, someone has already provided the link;