Adult chat no signing in req
If someone made that decision to do that, then that's their own fault.
For your child to have joined a server based around sensitive topics you don't really want them to be around, they would have had to have looked one up and made that conscious decision to join it.
Blocking a person and/or simply denying their friend requests are simple ways of handling this straight off the bat, and let's not get into the settings that you can put on your account to prevent people you don't have added, don't share a server with, etc, from messaging you.
Leading on from this, Discord does have a setting that will automatically block what you don't want to see- mostly NSFW things that I imagine many parents don't want their children being exposed to.
However, as stated in Discords rules/terms of conditions, server owners are required to have a set channel for NSFW content that requires you to confirm your 18 and safe to view.
In that retrospect, your child made that decision to view that content, and is not at the fault of the server owner or Discord itself, because quoting Teamspeak- "This is Teamspeak, not Spyspeak".
We also implemented a new Ban System that bans bad users and robots from the Chat, as well as a new contact us page so you can report issues to us.
There is a setting for a NSFW channel if your in a public server, and if you wish to go to it, it will ask if your 18 or over, of course children can press yes and just go through it, but its the parents or the childs fault.
When our 19 year old came home from college, we checked the phone as we do with those that live in our house. we were horrified to see the different groups and the beyond mature content - language, graphics, etc.....
I know you may want to think that your child is sweet and innocent and weren't put up to it voluntarily, but that's quite frankly not true from someone whose been using the app for over a year now.
I know it inside out unlike many of the reviews here, and I hope that this clears a few things up.