We used to be on an ancient vb3 platform that made checking up on individual bans implausible on a system logs level. Permanent bans were completely broken in the system logs, and I could only keep tabs on temp bans in system logs. They basically had to be checked via the mods' own self-reporting in the ban record, which in some cases were incomplete, obfuscated the truth, or in bish's case were eventually ignored entirely. I'd review the ban record but for bans like these it didn't paint an accurate picture, just bullshit they knew wouldn't raise any red flags and be investigated. In our team slack mod actions were supposed to be discussed and ironed out, too, but obviously if someone knew that their mod action wasn't justifiable, they would have no incentive to hold themselves accountable for it by bringing it up there.
Only a handful of the ex-mods abused the accountability systems, but that was enough to do a ton of damage. I should've kept a closer eye on things, but the best I can do is go back and make things right one by one.