But it is random and it need not be a biased number generator to produce an unfair outcome. Note the difference in unfair (what you are seeing) and biased.
Let's say we flip an unbiased coin (50% chance to land on heads or tails) ten times each. There are 2^10 different outcomes (including the order of the flip) and each outcome has the same probability (0.5^10). The outcome you get may not seem fair to you (same number of flips as me) but it is random and it is unbiased.
Sample outcomes:
H, H, T, T, T, T, T, T, T, H
T, H, H, H, H, H, H, H, H, H
If we let H be a piece of gear you want then in the first outcome you would only get three pieces, however in the second outcome you get nine. Let's say you currently have the first outcome and I have the second. You have the same number of tries as me, yet you got six less pieces of gear. You are fully allowed to say this is unfair since we put in the same amount of effort, however you are not allowed to say this is not random; it is, stop trolling.