@MrMazda said:
Pretty much every forum I have ever seen has been at least viewable without needing to login
To be fair, that's because, for pretty much every forum, if you can see them, you don't need to log in. [image: 1775693379582-dd7bc9ad-4d25-4076-843a-278cbd4d6480-image.jpeg]
Plenty of sites also have 'registered only' sections, so you might see a 'welcome' page or 'about us' page (think old phpBB) but the majority of the content is behind the login.
And with discord, I'm aware of quite a few sites that function like a forum but require a private invite and all the content is hidden. Honestly both approaches are reasonable, but it's weird to ignore that many porn-related sites are private access, not accessible to Google.