It's an anonymous image board like 4chan or 8chan/8kun. everyone is responsible for their own posts, as usual..
>inb4 Frens Chan "groomed" the Buffalo shooter aka "Frensgate"
Frens Chan, like 4chan and 8chan/8kun or any other anonymous imageboard, is not responsible for the posts of any of its users on their site or elsewhere (Discord, telegram etc). They've addressed concerns in this archived thread here: https://www.frenschan.org/z/res/171.html
Remember, MSM tried to use the Christchurch shooting to take down 8chan. This is nothing new.