I was surprised about this ratio (and the fact that it seems to work for them), too. I could imagine that a large percentage of lurkers and a maybe more reasonable community than other platforms could be helping factors?

My mastodon account is on a kind of small instance, and I’d love to be able to report posts directly to the originating instance, without also reporting it to “my” admin. I just don’t wasn’t then to waste their time locally blocking a clear spam account, that should (and usually will be) removed by the originating instance in a couple hours.