Unless everyone have an instance near home :) which is the case for me on Peertube, didn't checked for Lemmy though. I should check when I can. But for this to happen we need instances. Small, large, run by people, associations, communities, whatever.

Yes encoding is still a thing, but less analysis, online editing bullshit and advertising. So yeah Peeture is lighter than YouTube ;)

I agree that strict efficiency could be hard to tell on video diffusion only.