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I do not understand the people agreeing with Apple that search results are not guaranteed. App Store search does not nearly exist to serve developers; it exists to help users. This app was number one for years and has good reviews. I’ve used it myself and like it.
And then it vanishes. Something went wrong in Apple systems: either they been making a mistake for years, or a glitch has occurred. This developers support ticket is basically a bug report and Apple is ignoring it. It is pedantically correct to point out that search rankings can end at any moment. But this is far from a good result and I am baffled that some people are siding with Apple here to justify what is clearly a bug.
To the developer: before pulling the plug I strongly suggest trying a subscription model. I would probably pay a few dollars a year just to keep the app, heavy users would be even more willing to pay. I don’t know if your numbers make that sustainable but there may be a way to do so.