I got it now. My question was, Do you still get banned if no one reports you or finds a connection with banned accounts?
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Yes. You can be banned from forum even if no one reports you to the moderators. The moderators' responsibility is to maintain the forum's integrity, regardless of whether there are user reports. However, the moderation policies of each specific board may vary. Some moderators use automated scripts to detect rule-breakers, while others manually review the posts.
For example, in recent days, a scammer has repeatedly attempted to post a topic for a fake "Bitcointalk wallet", which is simply malware in disguise. These accounts are promptly banned within minutes. Maybe I am wrong, but I believe moderators have the capability to automatically detect such posts, or at the very least, they manually monitor new posts and react appropriately.