TL;DR: There was some drama over lesbians yesterday, and the mods made the sub private
Edit 2: An alternative sub is /s/LGB_Discussions
It is invite only right now.
This sub is invite-only. If you would like to be considered, please submit a request by using the "message the moderators" button below.
All requests will be vetted by existing members of the community, and you will be added if approved.
Apparently it's because of some drama.
There was a big fight yesterday that resulted in this. One woman was talking about how some lesbians take a while to feel comfortable admitting they have 0 interest in men, other woman went off saying all the lesbians there are telling her to sleep with men and that lesbians sleep with men. Completely went nuclear. Then the mod went nuclear and shut it all down and is now saying they're quitting and it'll just be unmodded/a dead community.
Here are some archives I found that might be related to the drama: