The consumer expectation may be different for web sites (as those were always closer to services than products and so you never "bought" them in the first place).

For traditional desktop software and standalone apps, the expectation is not different at all. I still own a lot of old pc games that I bought at some point and play occasionally and would find it extremely irritating if they suddenly stopped to function without any acceptable reason.

Recently, things may be changing with mandatory auto-updating, subscription models and many apps just being front-ends for server-side processes. But as far as I know, most of those changes are pushed by vendors/developers and accepted by consumers as a necessary evil (if at all). It's not at all that customers would suddenly expect something different.