Curation means choosing. It's rather easy to believe doing curation is basically saying "oh, here is a AAA title, it looks great, get in" and then "oh, here is a broken game". It's far more complicated than that.
Curation also means choosing between a shitload of indies. I think a lot of people on ERA but also among indies underestimate how many legitimate indie titles want to release their game.
I'll take an exemple with this game:
https://store.steampowered.com/app/834930/Bishi_and_the_Alien_Slime_Invasion/
When looking at it, you might think "Oh, it looks like a crappy shovelware. Looks like something that belong to Newsground or some shit like this".
When I looked over that point, I found that despite it's flaw, it's a game that has been made by an indie dev with a legitimate wish to make a game. Sure, it looks bad, sure it looks outdated and nothing special. But their intent here was to pour as much as they can into it and sell it.
There's a shiton of that kind of games. A lot more than you think and they represent the bulk of these 6000 games that released last year on Steam.
Now, let's say you want to curate away this game. Fine, you think it doesn't deserve a chance to make a little bit of its money back.
https://store.steampowered.com/app/353540/Stephens_Sausage_Roll/
Stephen's Sausage Roll is a ugly looking game, with terrible visuals. Heck even its banner looks like a MS Paint Job with a terrible font used. Guess what ?
https://www.metacritic.com/game/pc/stephens-sausage-roll
It seems like it's an amazing game, despite its menu looking like its from an asset flip.