My question may seem like a duplicate to How shall we deal with outdated answers no longer valid? but I'm here seeking consensus for a specific category of answers only, the ones which which feature an app's link and relies on them to be useful for a user. Consider this answer which I recently encountered:
The "Graffiti" writing technology from the old PalmOS devices is available for Android now, and supports letter at a time text input with a stylus (or presumably a finger). Graffiti for Android.
All the links to Play Store are dead. The answer, as of now, is of no use. Given the consensus which emerged here I have so far deleted such answers leaving a one line justification and a link to the consensus for further reading.
However, I lately realized that information about an app which is unavailable in Play Store can still be found on AppBrain. For example, here is the Graffiti for Android. AppBrain doesn't provide a link to such apps, but shows adequate information for a user to locate that app on web. It provides the package name in the URL, developer's name, size of the app, and the changelog showing when the app was unpublished et al.
While I am in complete agreement of the linked consensus, I want to ask if replacing Play Store's dead app links with AppBrain's is worth the effort? Of course, I'm asking this as a secondary approach, in case one is hesitant to take down or flag an answer.
One problem I could think of is for how long this feature of AppBrain would be available for dead Play Store apps? If they remove this feature, our replace links would turn dead. Perhaps knowing since how long this feature has been available could bring some confidence.
To be precise, this approach is proposed to be optional for everyone. If you think it is worth to save the answer and you've got the time, then only edit the links. Else, do flag for deletion.