I also would like to know because AFAIK, Bitsler just recently launched this year and I don't remember they have this kind of promo before.
I checked the mechanics and I think I won't participate on this, due to the following criteria.
Yes, this year Bitsler only had a sportsbook. This promotion you are referring to has been done several times. If you look closely at their forum in the same section of the contests tab you will see and know this third. There was also a separate event for the
Champions League only on October 19-28.1st2ndAnd there is also for all sports except soccer. - Weekly bitsler sports betting