I read this article on CoinDesk today. I have a good friend who always preaches not not leave your coins on ANY exchange. I don't know a lot of people in Crytpto, but the ones that I do know use a Trezor and love it.
The article says that a guy was on vacation in Cuba and he logged into Coinbase.com to check on Bitcoin. Apparently, Coin Base could tell that he was in Cuba and he received a "Notice of Account Closure and Pending Disablement" due to Cuba's view on Crypto.
It looks like when he gets back the the UK or US he is going to be able to supply an ID and get it straightened out. However, I would not want to have to sweat that out.
Yet another great reason to keep your coins out of exchanges.
https://www.coindesk.com/coinbases-cuba-problem-says-bitcoin-business/