That's my whole point. You said "worked hard on".
Right, but we're talking about curation. It doesn't matter what I think of my work; someone at Itch decides whether it counts as a "serious" project that deserves to be in the main listings. What counts as a serious work? Does it have to be on par with Shovel Knight, or is an ugly platformer with one level and no music OK? What if it has five levels? That's my concern - I don't want to have to worry about meeting some unknown quality standard or risk being delisted. As it is, everyone publishes on the same footing, and the staff picks out the things they want to highlight.
If you can think of some clear and concrete standards to support your suggestion, though, I would be interested in hearing them. Copyright infringement is already against the rules, so those instances of course need to be reported and removed. I'm not worried about those.
My point is some of the stuff posted on here are literally someone posting a YouTube tutorial they followed for an hour. Sometimes it's only PONG or another classic well known game they do not own, sometimes it's not even a game ffs.
Is that really such a problem, though? Yes, a lot of things posted here are learning experiences, prototypes, clones made for game jams, and so on. That can be a little frustrating as a user when you're looking for something specific, but the site is here for people to showcase their work, after all. I don't think it's fair to kick projects down to a less visible tier for such subjective reasons.