It's easy to find a real email address behind Hide My Email, but it doesn't really matter

AppleInsider can confirm that it's pretty easy to get somebody's real email from Hide My Email, but it's also not much of a concern. If you're using the feature as intended as a spam filter, there's really no issue at all.
Hide My Email is supposed to do just that, but it doesn't always
The Hide My Email feature allows iPhone, Mac, and iPad owners to sign up for websites and services using an anonymous email address. All emails sent to that address are then invisibly forwarded to the user's real