When the bubble hit $200 a handful of people came forward as "Bitcoin Millionaires", If I remember correctly.
The same people probably made an extra $250,000k overnight as it got closer BTC to $250.
If they cashed out, Good for them. But if not, as previously mentioned, they are probably in a mental institude because it wasn't a pretty dive from there.
Not bitcoin millionaires, but maybe (usd) millionaires ...