I doubt its randomness.

Was playing Mobilitywares BlackjackFree and with many 10s of 1000s of hands and some variation in play, I couldnt move the dial past 43% wins. So it lost my trust. BlackjackMH initially felt more natural but after about 1000 hands Im observing that the dealers more-than-two-card 21s are dramatically exceeding the statistical probability of 7%. Seems like this problem is either bad randomness algorithms or a built in function to get players to purchase chips.
PS Im just some person downloading a game; not a competing company attempting to slander the author (as has been stated in his in-app notifications.)
PPS Ive played a few more hundred hands and am still seeing an unusual frequency of dealer 21s. Just played a hand with two aces that I split, one of which pulled an ace. The latter hand lost because dealers last 3 cards were aces that hit 17. The odds against 6 aces being pulled in one hand (btwn dlr and me...no other participants) are pretty astronomical... I think something like 1 in 4,600,000.

DavidFosterWallace about Blackjack 21 Pro Multi-Hand, v8.0.3