For some reason most of it seems hidden, although I can't say why only 5 games are left or was it always like that?
The main problem with that section was people breaking upload rules and writing inappopriate tags, nudity, etc. due to none of the moderators wanting to go to that section. 18+ needs a more dedicated moderator or supervisor so that kind of stuff doesn't just slip by. Currently I'm waiting for a response from AK1 on creating a form/bot that will let you access the section if that's possible so this way if there is a rule breaker it won't be as severe or a "danger" on the front page.
Now idk why it's hidden or who decided to do that, but it may play in with said feature soon.