At least with GoG, this isn't an issue. I mean, if GoG goes out of business, people can just download the games and everything is good.
No ... if GoG goes out of business it is too late to download.
BUT you can still play the games that you have already downloaded. Thats the difference imho to stream.
Obviously...
Not always, but when a company is hitting hard times and getting close to folding, there are signs and some even give a warning as such. Point is, anyone who worries about such or is paying attention will have their entire catalog of games already downloaded. For steam, it really doesn't matter as you will have to do some heavy hacking to get those games to work, even if you do have them downloaded.
