If they wont really be putting up some importance on security neither they are running off a casino or exchange then it would surely be having that toll or effect later on which they shouldnt really be that confident.
Not only players could exploit possible security lapses or those common hackers around on trying out to snip if they could really bypass any service or platforms security and these are indeed common targets.
Somehow only few incidents that we are seeing about hacking incidents but we shouldnt really be that too confident.
Yeah and I won't be too confident if I am a casino site owner. It is not a good practice if you won't upgrade the security of the site and as what khaled0111 said, prevention is better than cure. It's better to be safe than sorry and it would be a problem if ever the platform you own is hacked and hacker was able to get some funds even if it's not all of it but refunding your customers would be a huge loss on profit plus the customers won't be confident enough to gamble in a site as what khaled0111 said which is they will lose the trust of their customers.