YouTube removes the Subscriptions button from the bottom bar after 9 years and moves it to the top of Home, and launches Custom Feeds you describe in your own words

A redesign of the YouTube app on Android and iOS: the Subscriptions tab, in the bottom bar since 2017, moves to a top bar inside Home as “Subs” alongside Live, Music and Movies & TV, and the side drawer disappears. With it come Custom Feeds: tap + and describe a topic or mood, and YouTube builds a feed for you; 3 for free accounts and 8 for Premium. The rollout starts in the US in English.