The first list greatly outweighs the second, and probably gives the house over a 5% edge, which is huge for blackjack. This is absolutely fine, but it could really piss some people off if they were unaware of the rules (I can image someone playing a few hands, starting to throw down big money, getting AA on a 1 BTC bet, and being really mad that they can't split)
The dealer doesn't 'peek' for blackjack before you act either. So you might split your 8's and double down when you've already lost because the dealer has blackjack. Every BTC blackjack site I know won't let you play if the dealer has blackjack.
Paying out when both player and dealer has blackjack is probably a bug, I would guess.
I'm not sure people will be willing to play at the casino if the house edge is too big when there are such low house edges available elsewhere. But maybe the minecraft element makes up for that to some players. Personally I'll play where the odds are best.