GVC affilaites (before August 2018 Bwinpartypartners) sneaked in with the migration last year a condition that will decrease the commission of the existing players after 3 years to 5% with casino. I was assured it wont be my case, but still this month I had to reclaim my original percentage. Was it a bug? Who knows - but if you do not check your %, you might be unhappy. Also it is good to start reading the T&C obviously. Quite often you will find new bad surprises...