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Because they don’t actually worship satan, rather exist solely to highlight religious (especially christian, given them being US-based) hypocrisy. The name choice and theming around satanic symbols was probably done more to symbolize going against the reality of christianity than anything to do with christian myths about satan, as well as to specifically piss off those christians that go on about religious freedom but are against the satanic temple getting the same freedoms as the christian church.
Achievements or multiplayer matching not being implemented in the game itself isn’t on GOG. They still allow you to download and launch any game you’ve bought, without even requiring galaxy.
Also lesser known is the fact that there are DRM-free games on steam. Download them once, you can play without having steam running or even installed. Using a client to download isn’t inherently DRM either.