Also i just answered my own question because i checked sanctioned suicide (suicide discussion forum) and thats something people already do there apparently
Either a livestreaming site expressly for the purpose of killing yourself on it or a forum expressly for the purpose of people linking to their livestreams on other sites where they're going to kill themselves
Someone brought this post on WPD to my attention yesterday but the comments don't really answer OP's question. Maybe you guys would know. Would a hypothetical website like this be legal? Also I don't intend to be the one to make it if so, so don't ask. I'm just curious.