How long ago did you buy them?
> As for upfront paid software, sometimes it's also just not worth it to the developer to make a whole new version anymore or they shut down.
Lots of businesses shut down, regardless of business model.
> more intentional and less panicked releases
As a software developer, I'm not sure what this is supposed to mean.
If those old games were subscriptions instead, they would probably be unplayable today. Their authentication servers would be shutdown after so few players remained that it wouldn't be worth it for the company to keep it going. Just like a lot of multiplayer games are closed nowadays.
The other thing games tended to do, that is basically a subscription, was frequent, sometimes yearly, releases. You just buy this years iteration of fifa or CoD. Playing the latest "version" will on current hardware, just like a subscription. Compare that to Fortnite, where you don't have a choice but play the latest version (i heard they removed building?!? not that i liked it, but that's certainly a change!).
As for upfront paid software, sometimes it's also just not worth it to the developer to make a whole new version anymore or they shut down. The shareware industry is pretty much dead today, for example, although free trials for cloud subs are still very common. I think the sub model smooths out the feast and famine cycles, ultimately, and make for more intentional and less panicked releases.