I agree with you, if we play gambling for entertainment purposes, usually do not think about fairness. So we don't need to check
every bet we have done to find out the fairness of the gambling site. Moreover, we do choose gambling sites that are popular and
trusted, so gambling sites reputation is guaranteed well. Because gambling sites have a good reputation, I believe they will be fair,
so there is no need to verify fairness.
You do not have to check every single bet, if you are the kind of gambler that always bets the same amount no matter what then as long as you verify some of those bets on each session and each one of them is what you expect then there is a very good chance that the rest of the best are also fine and you have nothing to worry about, now if you are a gambler that likes to make some big bets from time to time then those are precisely the ones you need to verify as a dishonest casino will most likely try to cheat you on those kind of bets.