Because this challenge is made by players, it could be that they just want to enliven it. I don't understand about this new challenge, will the player who makes the challenge will get advantage if there is a player who takes that challenge?
I do not see any advantages for those who create the challenges unless creators add a requirement where only those who use their referral code will be able to participate.
Perhaps some players create challenges for fun purpose only or to share their money to other lucky user.
Checked the challenges for a while and I have to say they are insane challenge.
Lets take one for example, win $1,000 by hitting 100x on Fruit Party game with $100 min bet.
Who will be interested with such challenge?
I think rollbit need to add more rules to create a challenge.
Otherwise, there will be too many insane challenge as anyone may create such as win $1 by hitting 1,000,000x on X-roulette game.