I fail to see the difference in the question Shira Ovide is asking. Web apps and app stores are equivalent from the point of view of end-user freedoms: in both cases, the code is controlled by someone else. Web browsers are even worse, because whatever code you have locally is transient and invalidated pretty much every other day.
Let me ask a different question: what if things that don't need to be services weren't a services? What if computing was primarily organized around end-user-controllable apps that only interface with remote services when needed?
(I.e. basically what we had on PC until recently.)
There is a substantial difference in that the app store is a middleman with the potential to control code between the user and the developer (intentionally explicitly ignoring the rare edge case of self-developed software).
On the web, the user can use any app in the world, but the app store limits the user to a specific pre-approved list of apps - there are both advantages and disadvantages to each approach, but that difference is meaningful.
Let me ask a different question: what if things that don't need to be services weren't a services? What if computing was primarily organized around end-user-controllable apps that only interface with remote services when needed?
(I.e. basically what we had on PC until recently.)