My main problem is this idiotic "anti society" manifesto that keeps getting spouted by every "hacker". Nobody does that garbage for altruistic reasons and the idea they can actually "take down society" simply isn't a realistic goal. It wasn't realistic in the early 90s before the mass technology surge and it isn't in today's world. Even if you completely compromised a financial institution's systems, you'd have to destroy the offsite disaster recovery back ups (likely a completely different company) AND destroy and hard copy / offline back ups.
The entire "fuck society" mantra is tired and stupid. If you really hated society, I hear Somalia is nice this time of year.
Outside of that, it actually isn't half bad. The hacking isn't a simple "oh, let me run some commands and do some code" kind of BS normally seen. It is running a program that took hundreds of hours to code on a system.
Well, it might get annoying, but last I checked, that is still the reason most people get into the more hardcore hacking: fuck society.
However, it doesn't necessarily seem they came up with "fuck society" as their actual mantra or tagline or group name. Look at the building they decided to call home. It's Fun Society, but the "un" is unlit. Perhaps it was just convenient, as it says "F Society" and they thought, "hey, that's perfect! Yeah, f society man!"
Also, it seems their goal isn't just to take a bank down, it's to shut down global commerce. If you can hit basically all the main banking and trade centers, target all the servers that even deal with currency exchange and commerce, I think it is theoretically possible. The scale of that attack is insane, and you'd have to take some seriously convoluted steps to screw with and cripple recovery efforts. Not impossible, but realistically beyond even a snowball's chance in hell.