Welcome! I'm glad you're always actively answering community questions, keep going and be a part of this community. I've see at your platform for new gambling sites it seems your bonus is not bad, but it's better to place a few more bonuses for the second or third bonus deposit.
For a casino a wager requirement of 40x is the medium one, a good requirement in my opinion. You shouldn't complain about, there are also casino that has a wager requirement of 100x, and that one isn't good as you say,
not this. Anyway, with slot machine you can easily reach it !
While a 40x wagering requirement is indeed quite normal for casinos (a bit on the high side as you will find casinos with a 30x or 35x requirement); it is not easy at all to reach it with slots as it all depends on luck. Already tried it multiple times (also on slots with a low volatility and a high RTP) and I always fail to complete the wagering requirement.
For a deposit bonus, the 40x wagering requirement is maximum enough, no wonder many rarely get a win because you're right, it's a bit difficult. I was wondering in my mind where is there a site that makes a wager requirement of 100x in the first deposit, it's even similar to a free welcome bonus, never mind. But most importantly I have seen, there is maximum bet amount also in the bonus rules notes 125% welcome bonus, someone who deposited the equivalent of €800 might not find it easy to complete the challenge wager.
The maximum bet amount when wagering is: EUR 1 / USD 1