Agreed. Scammers have become very skillful in making those official emails of gambling sites appear very much like their scam emails. It would be very difficult to notice the difference unless you make the effort to look for the differences very carefully.
Yes, that's correct. They can do that so easily that people who are less observant in reading the emails that go into their mailboxes won't notice. But maybe they can check the email's sender, and if they find that the domain name in the email is different, they should be careful and not carelessly click on the link.
If the email is an official email, they will definitely see the domain name behind it, such as
x@bitcasino.io or
x@livecoin.io, so it's an official email from the casino.