I get what you are saying, but you have to understand that Steam, Epic, GOG etc are not open platforms. They are private stores, and even Youtube has limits to what they can have in their platform, as bad as it is.
Yes and no. Steam and Youtube are different from GOG and Epic (and... I can't actually think of a curated user-video service. There's an Amazon video service of some kind I think.)
You can submit anything onto Steam or Youtube. It will be automatically removed if it violates content guidelines/Terms of Service, and it will live or die by the mercies of the algorithms and the whims of the public. These are the standards of an Open Platform - obey the rules, but you're free to do whatever otherwise. This is similar to most social media - like these here forums except one matter I'll bring up later -, and uses a process called Moderation - post-factum review of content.
You can't submit just anything to GOG or Epic. In order to have anything on those platforms, your content must not only obey the content guidelines and ToS, but also pass some invisible and undefinable "bar" of acceptability, be it one of quality or nature of content that some person responsible for curation finds personal issues with. These are Closed Platform standards - obey the rules and do what we say. This is similar to the rare kinds of social media that engage in "pre-moderation", such as submitting questions into a publicly visible chat for some person to reply to. It's also similar to these forums, in that not just anyone can get in - there are arbitrary and, to me personally, confusing requirements about registration emails.
And, if it were not for a glitch that I found and reported to the ResetERA administration first thing I did after my first log in here, we would not have been having this discussion now - as I would never have been able to register here. :)
Curation is a wonderful thing if you're one of the chosen few, ain't it.