There are many gamblers who underplay the importance of protecting their accounts on a gambling platform; they do not think it is very important, and some of them have not even considered it at all. Choosing to add an extra layer of protection on your casino account ensures not just the safety of the money you have deposited in your account but also prevents unwanted access to your account on a gambling platform. It is not impossible that there are underage gamblers or others who do not want to use their own details to pass KYC on a casino platform. They may be seeking to impersonate others who already have a profile on a casino, but it will be difficult for your account to be hacked and access to be gained if you have 2FA activated.
I don't know why gambling accounts can be treated and secured differently - less careful - than other accounts like email accounts, exchange accounts and more. Security must be practiced in a same way with any account on any platform and if an account is registered with an email address, there are two main things for security.
Secure that email with a strong password and with 2FA too.
Secure that account with another strong password and surely activate 2FA for it.
Make sure you make backups for both email address and the account. If there is any other layer of protection, do it.
Lastly, two other things for security.
Use open source password managers for creating passwords.
Use open source 2FA if possible.
Open source password managers.Open source Aegis 2FA.