Azkeel
If I'm not mistaken I heard hacking is punishable by life in prison.
I don't think there's any truth to that. Your sentence would depend on what criminal act you actually did, rather than just "hacking." Aside from that, "hacking" is a very loose term that mainstream media will apply to anything computer-related that they don't understand.
In the case of a distributed denial of service (DDoS) attack, all you're doing is overloading a server with requests for data. This can happen to a website if it experiences unexpected popularity and can't cope with the flood of legitimate users. It can also happen via a concerted effort to spam the server with data requests in order to make the server crash.
It's extremely difficult to stop a DDoS attack, difficult to separate the attackers from the legitimate users, and exceedingly expensive to find and prosecute thousands of people for something as simple as requesting data from a server in rapid succession. The key here is the numbers involved. Just as they can't arrest and prosecute everyone that participates in a protest or riot, they can't catch everyone that helps in a DDoS. Exceptions include cases where a few people happen to be running botnets. Then you only have to catch and prosecute a handful of people.
This was not the work of a few computer-savvy people. This was the work of thousands of people that are fed up with the bullshit.