It's true that Steam is a DRMed app store, and that means you are as owner of your game as in any other DRMed app store, but they prove regularly they are for the moment the most consumer friendly DRMed app store. They support linux, they support macos, they open their steam deck, they open their steamos beyond what is required legally, and many I don't remember.

GOG is great because of they are DRM-free app store but there are also challenges: no linux client, no support for the steam deck, etc..

There are some insane takes also: nobody care that windows 98 is not supported anymore, steam is no more responsible for the fragmentation than any others distributors, Ubisoft+, EA Access (and maybe Game Pass) are much worse than Steam