AFP:
It is the first time such a high profile figure from Macau's gaming industry has been arrested in an ongoing crackdown against the sector, with plans announced in September to increase government regulation.
...
Almost all gambling is forbidden in mainland China but it is permitted in Macau
...
Macau police have accused Chau and ten others of setting up an illegal cross-border gambling and a money-laundering syndicate that enabled mainland Chinese to place bets online.