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If you registered a Repopulation forum account after the 16th of June, you'll most likely need to recreate it:
https://www.therepopulation.com/index.php/news/90-website-restored
The lesson here is: "If you're running any kind of website that has regular traffic, you are going to be compromised at some point. It's not a matter of 'if', but 'when'. Make sure you implement the best security you can afford, and regardless of your security measures, make sure you have a robust backup policy."
The internet is pretty much the Wild West, except the potential rewards are far greater and the risks are negligible.