Each gambling site has additional security features. So, there is a small chance they can access our account only with the email or password that we create on an untrusted gambling site, which has the possibility of hacking or misusing customer data.
I habitually use a different username for each gambling platform I create, but I still use the same email with a different password.
It's also important to note that when gambling we should be extremely careful with our personal information especially, though they can only made their to way to those who regularly uses same password and email with this it becomes that easier for hackers or fake site to fetch the information of gamblers to try it in other site to know whether those information can be accessed in other sites.
When creating account on gambling site it's important to always different password to make account than using a regular password to everywhere with this it turns so quick when ever the password is leaked.
That is one of the basic rules but a lot of people use the same password on a lot of different sites. You would be surpised how much people even used the simplest passwords; I forgot where I read it but the statistics on top 10 of most used passwords are like: "123456" and "password".