About the moderation guidelines ...

• Please create a sidebar with some contents, at least a description of the community and some extra rules when applicable

They did not do that even after 2 months.

• Adding a banner and icon for the community makes it prettier. Please do.

They also did not do that, even tho it is an action that takes all of five minutes to do.

• Every community needs enough moderators.

The only mod is simply not present, so noone is actually moderating.

People are a lot less likely to participate in a community if the first thing you notice is that the creator doesn't give a sh*t about it. And like I explained in another comment, "regular" users can not fix this - only a mod can add a banner, the sidebar, rules, featured posts etc. so even on the off chance that someone decides to post there despite the first bad impression, the community will continue to have that first bad impression anyway.