I think we've also moved towards subscriptions as apps become clients for a backend service.

EG. A mapping app that includes a one time bundle of maps that don’t get updated can be sold as a one time purchase. If you provide continuous updates, which most people expect now, pulling off a one time purchase business model is HARD. The other option is versioned access or time limited support, which is really just a subscription model by a different name. That said I wish versioned access was still a thing. Photoshop CS is still fine for what I want, I’m happy to pay for an upgrade when it makes sense, but a continuing subscription to software that hasn’t substantially changed in a decade sucks.