My approach will likely improve over time, but for now it is based on a few main factors. 1) Is the content primarily concerned with teaching the Bible? 2) Does the teaching fall within what is broadly considered orthodox? 3) Is it a good "fit" for the UX of the app?

By "fit" I mostly mean duration. If there is a good sermon, but it's 45 min long, then it may not be approved. Since people are actively reading the Bible, ideally a video will say something meaningful and specific about a Bible passage without taking too long (<5 mins).