1) Is not even close to Flickr. It's way more like Instagram, which is an entirely different and unrelated thing.
2) Barely has docs. Everything just says "to do".
3) Doesn't even have a website! pixelfed.org just says "coming soon" since last year. It has 400 different language translations though, all telling you the same nothing.
How is that in any way superior?
Flickr lets you organize your photos and videos together. Peertube and Pixelfed don't do that. You keep suggesting one-off social sharing feed services, but those are entirely orthogonal to what Flickr and the now defunct MediaGoblin provide.
Your suggested replacements do entirely different things than what they're alleged to be replacing, and at least one of them doesn't even tell you how to run or use it.
MediaGoblin was the hope. It sounds like it might not have lost its developers if it hadn't gotten massively sidetracked by all the social networking federation stuff that was honestly always completely off brand for something that isn't a Twitter clone. You can't do anything about that now, of course, but putting it in a more accessible forge than Savannah might be a good start.
About the only thing Pixelfed has in common with Flickr is "it's about images". It's useless for many of MediaGoblin's use cases (which is ok, because it wants to be something else)
