1. They can use more secured ways to identify the real identity of their customer, the best thing to do here, aside from valid ID is they should add "take a selfie" on identity process.
2. They can also set a time limit of playing for a player, give notification if this would be their last game anymore for today.
3. Set a notification showing how long they've been playing.
With these kind of features, they might actually help or lessen the addiction of a gambler.
The first point is okay because it is just an addition to their verification process but the rest 2 points are a spoiler.
Why would any casino site implement these features by which their business might go down.
Setting a time limit and showing a notification of their gameplay duration are signs that people will spend less time on the site.
This will directly impact their revenue and no casino site would want that to happen.
If gambling sites start caring for their users it will eventually disrupt their business.