Last year, much of the drop was blamed on the loss of Australia. The market has historically been home to one of the world's most enthusiastic gambling populations, but regulatory fallout led all licensed operators to exit from Down Under.
That reasoning was again pointed to for 2018. The impact of the FIFA World Cup and changes in the poker market such as regulatory shifts in Europe were also cited. Regarding the latter, for example, Italy recently adopted stringent new rules for advertising that will severely limit customer acquisition opportunities for betting companies.
Although PRO didn't mention it, there's also no doubt strong competition from other operators has made the overall market perhaps tougher than it's been in years.
Market leader PokerStars continues to be a dominating presence and roll out extremely popular live and online events.