Bitgrail (RaiBlocks centered exchange) disabled all withdrawals without verification, without ANY prior notice to its users. This has resulted in the majority of user's coins being locked in the exchange unless they verify. However, the owner of BitGrail is little more than an angry, borderline unstable, child. He largely ignores his users, and when he does communicate, it is to openly threaten them on Reddit (
https://np.reddit.com/r/bitgrail/comments/7qbph2/for_those_who_accuse_us/). No one in their right mind would send their documents to him. Additionally, people who did attempt to verify have reportedly been waiting over 2 months. In short, no one can withdraw their coins.
Troy, one of the RaiBlocks developers, apparently spoke to the owner for "several hours", and they are still no further forward. When a coin dev has to step in to help you run your exchange, you know things are bad.
There is some suggestions that this might be an exit-scam, and that all coins are lost. Either way - scam or gross incompetence - I would advise anyone considering it to look elsewhere. Now that RaiBlocks is listed on KuCoin, there is no need to ever use BitGrail.