https://www.cnet.com/news/youtube-tests-explore-feature-to-expand-peoples-viewing-habits/

YouTube launched an experimental "Explore" tab to guide people to fresh videos and channels on mobile.

The tab will show at the bottom of the app's home screen for 1 percent of those using YouTube on iOS and is designed to let them "broaden their horizons", according to Tom Leung, the company's director of product management.