That is true - but I can legally download and keep a copy of all games I own on Steam on my hard drive forever. If they are online games/have DRM the online/activation servers might shut down some day, but every single player game I have should be useable forever. Until my drive fails anyway. Most games have had the DRM cracked. In my mind it's perfectly legal for me to take advantage of that crack to bypass the DRM in a case like this since I have legally purchased and downloaded the product.

I have a number of DRM-free games (from Steam, GOG, Humble Bundle, etc) that I have offline copies of. No one can take those away from me by shutting down a service.