Out of curiosity, I've ran some experiments on Facebook for stuff like this.

Results:

- Reporting a message does nothing no matter how much the content breaks their terms of use. 100% of messages I reported bounced back in a matter of minutes with "no action"

- However, using the "request another review" function, which is available after the initial "no action" response, actually seems to work. How quickly this works seems to vary, I've had actions taken as result of this from 1 day to multiple weeks.

Interesting, I've kind of made a hobby of reporting scams and hate speech and watching it take a week to come back with "it's no violation", requesting another and getting the same response in another week. I've never seen them do anything no matter how obvious or awful it is.