This is something that happened to me a few months ago. I don't know if it is a hack attempt, although I can't think of any way that there could be any danger or any personal information gained.
I don't have a Netflix account and never have done. I have a Gmail address which I have never used for public communication. Suddenly I started getting email to this Gmail address from Netflix - not a "Welcome to Netflix" email or one requesting address verification, but what looked like a monthly promo for an existing account. This was addressed to someone with a different real name, with that name not similar in any way to the Gmail name.
After a few of these messages I decided to investigate by going to Netflix and trying to log in with that email address. Using the "forgotten password" option I was able to get a password reset email, change the password and log in. The account appeared to be from Brazil, with some watch history but no other personal details stored and no payment information.
Soon the emails from Netflix started to ask me to update payment information. I didn't, of course, and then they changed to "your account will be suspended" and then "your account has been suspended". The "come back to Netflix" emails are still coming in occasionally.
I don't see how this could possibly be a phishing attempt - I carefully checked that I was on the real Netflix site, used a throwaway password not used on any other sites, and did not enter any of my personal information. I also checked the headers of the emails carefully and they were sent by Netflix. So is this just a mistake on somebody's part, mistyping an email address (although it's surprising that Netflix accepted it with no verification), or something more sinister?