User blog comment:MisterWoodhouse/Fandom is upgrading to a modern version of MediaWiki/@comment-5785681-20190620213154/@comment-3974211-20190620220001

As Brandon said, Discord is unaffiliated with Fandom and it's each community's choice to use the platform.

However, regarding your specific issue with Discord: I've never actually encountered a Discord that actually employs the "hide chat history" feature (since it's far too annoying even for "authorised" users, all it takes is alt-tab and -poof-). All you have to do is join your community's Discord and you will (almost certainly) have access to everything that's ever been said, barring moderated content. It's not really any more "hidden" than Fandom's own Discussions feature, which is likewise not actually integrated into the main platform beyond a button to take you there (e.g. stuff you do on Discussions isn't tracked in Recent Activity, user contributions, etc).