I’d assume the biggest reason, in addition to what others have said, is the difference in user numbers. It’s a lot easier to be a good mod at this scale than at the massive scale of Reddit, especially with the rampant AI bots, and without powerful tools like defederation, the clearly visible mod log, etc.

I’d assume most people bothering to moderate, even on Reddit, intend to do a good job with every report, but being overworked forces people’s hand.