Earlier quoted context omitted.
Because the companies make a large amount of money on the platform. Look at Apple/Google/MS/Sony/Nintendo charging for access to the platform - either explicitly for online play, by taking a cut of sales on the platform, or in the case of the console makers - both. As someone who prefers to play games alone, it's frustrating. The first five minutes after installing Steam is a constantly stream of "stfu and stop shovi…
I get all my games from Codex and Fitgirl. No multiplayer, but you don't want that anyway.
(Anybody reading this - there are publicly available NFO files and posts from Fitgirl that indicate what is included in a release/repack. I would never advocate violating copyright, and I certainly do not do so in a personal capacity.)