First of all I have to say that I don't mind winning money, I mean who does not like free money? I also understand what bunq is trying to achieve with the promo: attract new customers that fall in love with bunq while using it.
However I feel promos like the recent "1000€ per day" will mostly only attract a lot of "gold diggers" who will stay with bunq until the promo is over and then leave. Sure, one possible barrier to such people could be that you have to be Premium and I actually don't know if Premium users that are in the trial month are also eligible for the contest (I hope they are not)
So I suggest that the next promo should not be about money, but to give out lifetime bunq Premium accounts, let's say 5 or 10.
The terms for this could be like the current promo, i.e. you have to use your card/Apple Pay to participate, but I also think you should be a paying Premium member for that.
Another idea would be like half a year of free bunq Premium for a few people.
In general promos should be about bunq and not about money.