You pretty much have to approach iTunes, Google Play, Steam, Xbox, PlayStation, …
... as you would Netflix and Spotify: You’re only renting the stuff.
When buying apps on Google Play, I do so in the full knowledge they may (and some do) stop working at any time.
But the prices have to match.
That’s also why I only buy heavily discounted games for my son’s Xbox. Luckily, like me, he’s not into the latest multi-player FPS, so that’s never been an issue.
Similarly, PC games I only buy from GOG.com. They don’t have the latest AAA titles, but I can find what *I* want to play. And I don’t have time to fit in on-line multi-player anyway, so DRM-free single player (or LAN/off-line multi-player) titles fit my needs perfectly.
Funnily enough, when games are removed for sale from GOG, they’re still left in the libraries of those who bought them when GOG did have them for sale.