Nice case for E2E, which I put in the human rights perspective of “Freedom of Impression” - the right of users not platforms to control what gets into our individual feeds. In an age of global feeds, freedom of expression is only practical if paired with freedom of impression. The best way to make that happen, since many users have difficulty managing the details for themselves, is by adding the right of Delegation to a service that acts as their agent (often referred to as "middleware").
The broad case for that -- and how and why it can work -- is in my series in Tech Policy Press with Chris Riley, Delegation, Or, The Twenty Nine Words That The Internet Forgot.
Some hints of how the Fediverse might open up the market to facilitate that is in my Tech Policy Press piece, Into the Plativerse… Through Fiddleware?