From the article:
“Following recent fallout from the subreddit blackouts, and the controversial comments from CEO Steve Huffman, Reddit has been having a tough time in the eyes of its users who have been reportedly leaving the platform and setting up alternatives on the fediverse (such as Lemmy or kbin), used by the Twitter alternative Mastodon.”
“Sophisticated and highly targeted attack”, ie some dumbo click an official looking email and provided their credentials to a spoofed webpage.
I hope it was Huffman.
Every. Time.
The code itself might be highly complex and sophisticated, but it almost always takes a malicious link to get it into the system where it can do its work.