There are different types of DRM. Your original post was that Steam "forces always online DRM" and "you never own anything you buy". This doesn't really apply to Steam DRM. You don't need to be always-online and it is not for anti-piracy. It sounds more like you are describing Denuvo which is another thing entirely. Comparing Steam DRM to Denuvo is like comparing the Wright flyer to a fighter jet.
I don't like DRM either but at the end of the day I can just run Steamless so I don't really care. Streaming services like Netflix have the same thing but it all can be pirated anyway so no big deal. It would be different if Steam actually implemented effective DRM, but it doesn't.
That copy is very much designed to justify the fact that Steam allows games to publish with double or even triple DRM solutions under the Steam platform.
Steam allows it, but they actually officially discourage the use of third party DRM
Anti-tamper / DRM: In general we don't recommend use of such solutions across any PC platforms, as they may impact disk usage and overall performance. Getting them fully functional in the Wine environment can take some time and add significant latency to getting your title supported.