Literal genocidal content in Myanmar, calling other groups of people not even human, that it wasn't murder because they were just animals, that they all needed to be killed based on false pretenses, etc, mostly did not "violate Meta's community standards," as well documented in a four part blog post series available here:
https://erinkissane.com/archivesOne can hardly expect penis pictures in PMs to minors to violate their standards, given that.
About the only thing one can expect to violate their standards are things that are critical of Meta, as that might interfere with their quarterly profits.