You can import YouTube subscriptions by clicking on the Sources tab and then tapping on the YouTube source (says tap to open in small print). You can then sign in and after that you’ll have import subscriptions as well as import playlists buttons.

For real. I tried to show my dad a YouTube video on his phone not too long ago and just outright gave up after seeing that the duration of the ads would exceed the duration of the video. Revanced gang forever