For example, a fitness app named "Sweat with Kayla"[1] (apparently a renowned female personal trainer) is currently featured prominently at the top of the front page of the Australian App Store.
The app description states:
Sweat with Kayla is free to download. All consumers are welcome to a free 7-day trial period. Should you choose to continue use of the Sweat with Kayla app, we offer a single auto-renewing subscription option:
Just $4.61/week ($19.99/month)
Is that trial period contrary to the App Store Review Guidelines?[2] Clause 2.9 says: "Apps that are "demo", "trial", or "test" versions will be rejected." Strictly speaking, "Sweat with Kayla" might be a "full" version, because you get the whole thing (at least for seven days).
On the other hand, clause 11.9 says: "Apps containing content or services that expire after a limited time will be rejected, except for specific approved content (e.g. films, television programs, music, books)." Perhaps Apple takes a broad approach to this clause and Kayla's workouts and food plans were seen to be sufficiently close to the named examples of "specific approved content" to pass muster. It would be surprising if Apple had decided to feature the app without reading its description.
Interestingly, the most favourable feedback left by those who have posted reviews for "Sweat with Kayla" appears to be gratitude for the trial period, which saved reviewers from paying anything before deleting it.
[1] https://itunes.apple.com/au/app/sweat-with-kayla/id104923458...
[2] https://developer.apple.com/app-store/review/guidelines/