Even a professional gambler won't be able to fulfill requirements that are too high since gambling is not about professionalism and even a professional gambler has to go through losses and streaks of losses. So someone who is in the process of trying to complete a wagering requirement is most likely to lose all their bankroll or most of it in between the process.
So it is outright unfair if a casino has a wagering requirement of more than 1x for a deposited amount, if they are giving a bonus with the deposit and have the wagering requirements on that, that's understandable.
Fulfilling onerous wagering criteria takes a long period of time before gamblers figure out how to pass such hurdles. But with implemented good gambling set-ups, gamblers tends to make significant profits. Gambling is one of the most difficult tasks for gamblers to do; as a skilled gambler, you would not make losses; they don't realize that losers do the majority of the counting. It is critical to identify the variables that prevent one from obtaining complete knowledge and profits from gambling; after all, the system is created for individuals to lose money.