Thanks. We are considering that but are waiting to hear back from itch first.
(1) We are not certain if removing the tag will automatically un-shadowban the game.
(2) The tag has been helpful in preventing folks from inadvertently playing a game they would otherwise avoid. Too many people do not read warning labels. In the past, we've had a few people who did not pay attention and wound up being upset by the game.
If itch does not fix this then we will try removing that tag next. We do believe that there are some NSFW games that are not adult games but how those labels are interpreted seem to be determined differently by each community.