it would take a lot more than 500 BTC to get 100M HIVE, as not everyone is willing to sell at 12 cents
When I last bought on Huobi, it took several days to fill my order and that was just 77k hive. And even transfer was not open that time. 100M HIVE would not be easy to buy.
It would be really difficult. I know that some people have looked for OTC because whenever they try to buy, they bump the price too far.