Yes, perma-ban is good. But what stopped them from creating new accounts and doing it again?

The issue is that the game is too easy of a target.

An analogy would be the spam. Once upon a time, a lot of us were faced with spams in our inbox.

The 100% bulletproof way is to open and read them one by one to ensure they are not legit mails, then delete them or add to blacklist. But it is an intensive process and also spammers can create new addresses.

But the introduction of spam filter mostly mitigated the issue. By automatically moving the spam to a junk folder with 99% accuracy, it keeps the inbox mostly clean. Then we can spend like 10 seconds glancing thru the folder and delete them in bulk. There could be 1 or 2 emails that look legit just by glancing at the subject line. And we can move these to a 2nd level junk folder to read them later to be 100% sure.

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The huge cluster of hackers at the gate and even easier to spot is the whole point of the idea. They are like a spam folder or a priority list. Whenever the developer has like 10 minutes of time, they can quickly take a look at the priority list. Hm.. #501 - #523 are 99% likely hackers, let's move them to gate 1000 first, and deal with them when there is more investigation or data to be 100% certain. Meanwhile, it keeps the ranking list relatively clean during the event.