May want to consider dropping down a line in our rules and adding an excerpt from the previously linked Discord guidelines should the NSFW channel not be removed; or at the very least outline the severity of breaking Discord's own guidelines. Additionally, probably highlight the fact that the 'NSFW' channel is exempt from rules A, B, and C with the exception of X, Y and Z or something along those lines.
Unrelated to that, I do agree that we keep things in line with our current structure of rules, but do keep in mind that our [game] Servers are Public and that it is explicitly stated what we do or do not allow ingame. With that in mind, provided that the channel is explicitly stating that it is a channel that is 'NSFW' (would also recommend throwing an "18+ only" in there somewhere, just for the principle of the matter) it is entirely up to the discretion of the user to voluntarily access it.
Simply put, the differences are that:
Discord
The user has to go out of their way to willingly view the content and upon accessing it, has acknowledged the fact that the content in the channel is 'NSFW' and that they are alright with viewing it.
Game Server
The user is not subjected to such content because it is publicly against the rules of the server; it is not tolerated in any shape or form and therefore the user can expect not to see any 'NSFW' content.
Notice that the main distinction is that the user is either willingly accessing that sort of content, or willingly accepts that it is not permitted and can therefore expect not to see it. The users are not expected to enter the 'NSFW' channel, nor will they ever have to. It doesn't make sense to compare the two as they share very little in common, other than the fact that both are endorsed by Xeno Gamers.
With that said, I'm fine with it as long as the following [previously mentioned in the thread] is considered:
1. Implementation of a role to allow users to access the channel
2. Routine monitoring to ensure that the content does not breach our own rules/terms as well as Discord's