Quick shout-out to Grayjay: An app to watch videos on any platform - reducing the power of individual services. The Software is open-source and can be found here: https://gitlab.futo.org/videostreaming/grayjay
I will test this out for myself and hope someone here finds this useful.
Futo (the organisation developing this app) appears to be a tech billionaire (Eron Wolf) firing his money at the tech industry until it stops being so shit.
This is from the about page on their website:
(From: https://futo.org/what-is-futo/)
What they say and what they will do could of course differ but they do go to great pains to paint themselves as fundamentally opposed to be sort of action you are worried about.
Words are cheap. Google used to write “don’t be evil”. If they are a billionaire, they could easily afford to make this FOSS.