Good day @MajesticBlueFalcon
To answer your question, we do not have any hard or fast rules on how we decide on what projects go into the curated project category or not. The current process is you have to apply for the project reps role under groups. You can find it here:
https://forum.weightgaming.com/g/Rep
We then evaluate if your game complies with our rules, how popular it is, and where it is in development/how consistent development is looking. We then discuss internally if we feel the project should have a curated category.
In general projects we pick we either feel deserve to be highlighted or have so much traffic that them having their own category is warranted from a standpoint of just keeping the site organized.
That all being said we are being a bit more stingy with it due to the fact we plan on phasing it out with a new system that will be integrated in with the main site.