I found this today. It's for android, so with iOS a can't test :(
https://grayjay.app
https://odysee.com/@rossmanngroup:a/the-best-way-to-watch-online-video-my:c
quoting note1sk0…79nr#FreeTube Is really interesting software for streaming YouTube videos. Its FOSS with some cool privacy features. It has some bugs, but for me Its good and i can recommend it 🔻🔻🔻
https://freetubeapp.io/