Well they're hosting it, for free, so they get to decide the same way as someone hosting a party. But it's quite obvious they see the responsibility with the p

Well they're hosting it, for free, so they get to decide the same way as someone hosting a party. But it's quite obvious they see the responsibility with the project owners first, and will only step in if it escalates. A written policy can make the owner's jobs a bit easier because they can just point at it and deflect criticism to GH.