I do not think the games are rigged. It's more likely a lack of probability theory knowledge and inadequate programming skills.
I'm a decent cribbage player. I beat Bill approximately 50% of the time. I have noticed that this game is rigged. I expect for Bill to be marginally better than me in the crib as the optimization programming is easiest for picking crib cards. I dominate Bill in play as pegging - which is to be expected as it is the hardest thing to optimize. Where the computer's cheating is obvious the the non-random way Bill routinely achieves statistically unlikely hands late in the game. The appearance of these hands is strongly correlated to Bill being behind.
Based on a sample size of 20 rounds with average of 9 games. ~170 total games. Average score of hands dealt to Bill is strongly correlated with how late in round and if Bill is behind. Average score of 6 cards dealt to Bill is nearly 3 points higher when Bill is behind after game 5. Bill shows average higher points dealt to himself if he is behind at the beginning of the round. Pattern does not hold for me as the average score for me per game is about the same regardless of. The six cards originally dealt should be random. The fact that it isn't shows the game is rigged. Another example: in Game 8 of each of the 20 rounds Bill averaged 5 points (11.5) higher in terms of the point potential of the six card deal than I did. During the same 20 game 8's the highest six card hand I was dealt was 8, while I averaged 6 points. Either a huge statistical oddity or transparent cheating.
In addition, the computer either knows or manipulates the turn card at times. I've noticed that Bill only deviates from the highest average score + crib selection when the turn card plus the highest average score selection would have resulted in high points for myself. This deviation never happens early in the round or if Bill is ahead. Bill would either have to know what I put in the crib or what the turn card is.
Answer: The game(s) are only as good as the people who programmed them. When playing crib it's amazing how many times Bill gets his cut hm...
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