For me it's a bad support and slow actions towards the concern of the user. I notice that some gambling sites prioritize the VIP or big bettors rather than normal or low fund bettors and they favor them and took action immediately than the normal users, I think I think having the same treatment in regards with concerns is better than prioritizing the VIP bettors.
The same criteria. Bad support is really irritating. I wonder why they can't employ professionals if their earnings are too high? But happily, there are online casinos with good support.