Yeah I am aware of that service and tend to think this sort of thing is 'outside their scope' as well... hence my suggestion to integrate a protection mechanism into the wallet feed itself.
Perhaps it can be expanded to do that but I think a front-end approach would be more effective... or at least more 'in your face' when looking at the memos.
When a link or author is marked as malicious, their memo are immediately followed by mine warning the user that received it.
Integrating the wallet feature to grey out memos from malicious users would be better though. (see thread below)
cc: @curatorcat
Nice solutions!