I just have one question for whoever account was frozen on blackjack. Are you from the USA. If this is true they may have done this to avoid the US Government and they legal hassles.
Because online casino play is considered illegal in their eyes. I think that is what started the whole poker gray area in the USA. Since poker is a skill gambling game It does not fall under the laws made in the past few years.
I may be wrong about the casino part. From what I have seen I thought that It was illegal in most states and now the nation to gamble on games of chance against the house online. Not including poker. My source was a group of poker dealers talking about it.