Why do some communities disappear from the community browsers?

I wanted to introduce a friend to Lemmy and while showing the community browsers

https://lemmyverse.net and https://browse.feddit.de/

I realised that the community I mod (https://feddit.de/c/cozygames) has disappeared from both browsers. It was definitely there before. And it's already a few weeks old, has activity and subscribers from different instances.

Why do some communities get removed?

It's not NSFW or anything and other communities from the same instance can still be found.