There is a basic web version if you visit https://sparkbible.com/read. I built it mainly for SEO purposes, but eventually I do see it having feature parity with the other apps.
Sure. Essentially all the videos, topics, and any new type of resources added in the future have Bible reference(s) set (this happens via admin controls). This is another big reason content has to be manually reviewed before allowing it to show up in the app.
I have an admin back-end that allows for reviewing, editing metadata, and then approving resources. Once approved new videos get pulled into the app via an API without requiring an app update.
It is currently mostly resources from Protestant teachers (iirc Yale has some good videos on there that include back & forth discussion from both Protestant and Catholic scholars). This is driven mostly by my familiarity with Protestant resources, but I believe it's also true there's less video content available for Catholic or Orthodox teaching that focuses particularly on the Bible (correct me if I'm wrong). I think it would be great for people to have resources from a variety of faith traditions though.