Never underestimate the determination of bored Reddit trolls.
(Actually, the attackers were likely cybercriminals looking for the whole database of current users. Even with salted hashed passwords, it's trivial to find commonly used passwords and reuse the e-mail address and password to attack other accounts, such as bank accounts, paypal, amazon, facebook, gmail, etc. Each pilfered account adds up to a payday when you sell them on the black market, for things such as money laundering, account draining, and spam)
(Actually, the attackers were likely cybercriminals looking for the whole database of current users. Even with salted hashed passwords, it's trivial to find commonly used passwords and reuse the e-mail address and password to attack other accounts, such as bank accounts, paypal, amazon, facebook, gmail, etc. Each pilfered account adds up to a payday when you sell them on the black market, for things such as money laundering, account draining, and spam)