That is the thing we can do to be careful of unknown things that we don't know. We can share the public email we have with others so that we can prevent ourselves from the bad things.
For our financial deals, we can use a different email that is not related to other things. We should be careful sharing the email address because we are on the Internet which we don't know when bad things may comes.
You can separate each email account for different purposes to prevent exploitation or hacking. We don't know how the hackers work so we must be careful. Stopping being lazy is the best thing we can do to save ourselves.
When registering on gambling platforms or any other platforms, it makes sense to use aliases for your email addresses. This is convenient and safe, as your main address won't fall into the hands of abusers if the gambling platform's user database is hacked. It's just a pity that not every email service offers this feature.