Some people just do this for fun or as a challenge.
Some people want to sell the data, others hate the content so much that they simply want to destroy it.
Some people want to find users to take a ransom from.
The reason of the content deletion is probably just that the attacker(s) wanted to...
I'm asking this for a friend, here:
Please share details why you think that accounts haven't been breached.
Please tell the people at least to a vague amount how secure their passwords were/are.
Did you use salted hashes? Did you use breakable hashes like MD5 or sha-1?
If you didn't use...
"Its kinda impressive just how creative hackers can get!"
Actually, that's not impressive. If you've got a lot of source code, you will find security loopholes sooner or later.
There are some open source libraries that include unfixed security issues since years because people are too lazy to...