Who still has a bay12 account?
Myspace was still getting about 50 million unique monthly visitors as recently as 2015, and I'm guessing that most of the actual decline happened well before that point.
But whether or not people
actively use Myspace isn't important. There are about 1 billion inactive accounts, so if you can breach those you can data-mine those as an attack vector. So about 1/7th of the planet
have a Myspace account. They don't use it, but they still
have it. At least Myspace does.
What was happening is that the hackers ran a script against your email to try and log in to all known sites. It's up to your imagination about how that went, but what they may then be able to do is narrow down which emails have accounts and which don't. You got three password reset requests, but they might have run your email against 50 sites, most of which you don't have. They can then glean info from those requests to narrow down which emails have active accounts on which sites. This is why it's important not indicate whether an email has an account or not on login screens. Don't give the hackers any information.
https://askleo.com/how-do-i-find-out-whos-trying-to-change-my-password/There's a warning there, if you receive the "password reset" emails there may be a link to report that it wasn't you. Do not click these, the email itself warning about the attempted account access may itself be a phishing email.