I think you should have a personal email for the forum even though it may in my estimation not be necessary unless you want to sign up on a casino.
You don't necessarily needs to use same email here to sign up for casinos, in fact I will advise others not to in order to avoid having higher risks for data breach.
Also the email is quite important especially when having account recovery issues
https://bitcointalk.org/index.php?topic=5457586.msg65639217#msg65639217There is an option to keep your email hidden and I totally recommend selecting that option if you choose to use your email.
The user hide his email.
This is a default mechanism, when a user sign up their email account is hidden except changed by the user later on.