A handful of Android apps take the top of the page at a time, the way a newsroom gives a few stories the lead and holds the rest for later.
A directory shows every app the same size, all at once. Featured APKs does not: a small number take the top of the page, chosen the way a newsroom decides which story leads, and the rest sit one screen down, waiting.
An app takes the top of the page because it is genuine, still maintained, and worth the space, not because a developer asked for it. The spot rotates, and nobody buys their way into it.
The page you land on is already built as plain HTML by the time you arrive, lead spot and all, so it opens the same instant whether you are on fibre or a slow connection.
Think an app deserves the top of the page and has not had it yet? Send it through the contact form, and it goes into consideration for the next spot.
A cloned installer, an unlocked copy of a paid app, or software wearing a publisher name it does not own does not qualify for the top of the page, whatever its rating claims.
Featured APKs is edited by a small group who treat the top of the page as a judgment call, not an auction, and are willing to defend the call.
The lineup changes as apps change. An app that stops being maintained loses its spot rather than keeping it on reputation.
The top of the page is a claim about which app deserves it most.