This site looks kinda weird. For one, it looks much more polished than any similar site I've seen so far. They have really good SEO as well, always popping up pretty high on Google. They have a massive selection of content.
How can they still be up?
What's the catch/what's wrong with them?
Also, what do they mean by "preinstalled"? The game isn't preinstalled if I have to install it from them, is it?
IGG is very toxic website that has a history of adding various types of malware (both web and games), including cryptominers.
It's higher on that list, even though for some reason it only highlights the (barely coherent) silliness that it has DRM.
I'm not know the nosteam website, it's odd that they mention it on the list but it's not listed.
IGG /nosteam uploads presumably means that they are the sources of the games. I don't know a huge amount about game piracy, but it sounds like IGG / nosteam are not trustworthy.