It actually did though. They now include free DVR and on-demand on most packages to compete with streaming. In some cases they include a streaming service with the cable package too.

They have a monopoly on content. If you want to watch Star Trek, you need Paramount+ for example. If you just want to watch Sci-Fi in general any streaming service would work but if you want to watch a specific show, then you still only have 1, maybe 2 options.