I disagree with the author, the enshittification of Steam started ages ago. Day one, in fact. It's come and gone in waves.
Yesterday there was an article on the exploitative practices of Roblox doing the rounds around here. Some of the bad praxis around monetized UGC called out there was pioneered by Steam. Online DRM for single player games? Steam was there at ground level. NFT stock markets? Steam tried really hard, they were just bad at it. Gig economy automation replacing human moderation and greenlight processes? They banged their head against that wall until they uberified PC game development successfully. Loot boxes? They are remarkably resilient. Where others have moved on, Valve insists on keeping them around for CounterStrike 2.
Also, CounterStrike 2.
There are also ways in which Steam is ahead of the competition, or they wouldn't have the near-monopolistic position they have. Their Linux support may be motivated entirely out of spite and an ironic fear of Microsoft's monopoly, but it's welcomed. Their client is easily the best in the market and there are crucial features from it that should have been universalized by MS or Nvidia and still haven't been, somehow. It's good stuff.
But it's been enshittified since day one of Steam, when it launched torjan horsed with CS and Half Life 2, and it remains problematic in many areas, including its role as a single point of failure for game preservation on PC.