Newpipe is a phone app that plays youtube videos without ads. You can import your subscription list from YT (without signing in to a google account). And videos can be downloaded through Newpipe as well.

Edit: Newpipe sucks, actually. Don't use it, and definitely don't tell anyone about it.

Newpipe is a phone app that plays youtube videos without ads. You can import your subscription list from YT (without signing in to a google account). And videos can be downloaded through Newpipe as well.