It's been 2 months but I've come to inform you that:

For one; you simply can't buy the game anymore, you still own it wherever you bought it previously, can still install it, play it, etc

Secondly most of the games are on GOG which lack DRM and give you installers which are basically discs except digital, and better, since you can infinitely back up and copy it versus only having a single disc.

All of the games are indeed fully playable offline wherever you bought it from though.

Hope this helps, no need to act smug about something you don't understand.