Well, to be fair, it
does exist in dice game. You can set it like this

and voila, you have a 50-50 probability of losing or winning.

Your win is going to be a little smaller than what you bet, due to the house edge, but the probability of it will be exactly 50%.
Logically, as I think of it, it does exist in all gambling games.

. 50-50, it is either you win or you lose in a bet. But it is more complicated on the technical side, since, for that, we need to calculate the probability or the chance of winning. So somehow Titangel claim of 50-50 slots is logically right(you win or lose) but then technically unsupported.
We have smaller events each week of December.
I'll keep you posted on it.
Looking forward to this.