The founder of GrapheneOS was swatted (prank calling armed police to their location to try and escalate an attack) multiple times up to April 2023.
A past contributor received bogus legal threats to himself sent to his university, which he released:
https://renlord.com/posts/2020-03-25-copperheados-legal-threat/
The current GrapheneOS lead developer is Ukrainian who had been conscripted in the war there.
We've been aware of people in other projects recieving a toxic working environment. The DivestOS developer quit over this.