I can't and won't comment on a particular site, but people get banned from AdSense for breaking the rules, but not all rule breaking will get you instantly banned. The fastest way to get banned is Click-Fraud. Publishers committing or failing to prevent click-fraud can be terminated very quickly. AdSense has a commitment to ensure a safe and fair environment to advertisers and they enforce that sternly. Other policy issues (such as placing ads on content that isn't family safe) will usually start with a warning, possibly with ad-serving being temporarily suspended. Repeatedly violating those policies will be more likely to lead to a ban.