Ah yes, the old discussion about card distribution. The cards are absolutely ALWAYS entirely random, whether your opponent is human or a computer. Whether a player has bought credits, has often won/lost, etc. is completely irrelevant to how cards are distributed.
We have introduced a rule that all players will receive new cards in case any player gets 31 or fire right at the beginning of a round. This is a fairness measure to prevent players from losing a game withour really having played (most important in rooms with only one life).
For the computer savvy folks - this is the used algorithm that generates a random card deck at the beginning of each round: