In casinos bonus funds, I understand that smaller bonus offers with simpler terms and conditions is easier to understand, and manage by gamblers than big offers with very strict conditions. For instance, some casino bonuses require 30x- 40x wagering requirement before you can be able to withdraw your fund, this condition is absolutely difficult for many gamblers to reach making some gamblers to even ignore such large bonus with such strict conditions, but casino bonus with wagering requirement of maybe 3x-4x is more convenient for gamers or gamblers to reach, and to me, the remains the best casino bonus offer.
It is necessary to read, and understand the terms of use of casino bonuses because making use of them.
OP, I don't know why you say it like that, but smaller bonuses don't come with smaller wagering requirements, almost all bonuses that you get in a casino will have at least 25x to 30x wagering requirement for gamblers to complete before they can finally make a withdrawal, and this is the reason why it is nearly impossible for any gambler to actually win something with those bonuses and the deposits they have made. Casino bonuses are not provided so that gamblers can make money with it, they are provided to make gamblers engaged and make them stay longer within the casino, because that increases their chances of having an urge to gamble more once they run out of funds, and that may make them deposit more money.
This is the reason why most casinos will try to have a deposit bonus for every deposit a gambler makes, because they know some gamblers are so greedy that if they exhaust one deposit with the bonus they had claimed, they might make another deposit only to claim the bonus again so that they can gamble with more funds again, and such gamblers don't think about the wagering requirement that comes with that bonus which is basically not going to let them make a withdrawal even if they manage to win something initially until they complete the wagering requirement.