I understand the history this place has with myspleen, and the ease of use for people who have been here for years, but it’s long since past time for people to stop releasing things there. It’s a hindrance and an annoyance more than anything.
MySpleen isn’t the only place things are uploaded. It’s usually just an initial release and it’s mentioned so the people who do have accounts can just easily go check there. Everyone who doesn’t can simply send a private message to the project creator and be directed to an alternate platform where the project can be found.
Specifically in the cases of 4K77/83, those projects have their own forum where all the releases can be found pretty easily, including the more niche ones like the heavy/maximum DNR 4K83 releases.
I also think the general sense of paranoia about links and such should be dialed back, too. It’s beyond obvious, after about 20-plus years, that Lucasfilm is never going to come after this place, or Harmy, or Adywan, or Hal, or anyone else who has gotten any sort of notice for messing with Star Wars. So long as you’re not trying to make money off any of these projects, fan-restorations and fan-edits are too limited in scope and audience to pose any sort of legitimate threat to any revenue stream.
Not a risk the admins are willing to take. Open links will likely never be allowed here and for very good reason. It’s pretty easy to just private message the creator of a project, and at least two of the people you specifically mentioned do share links to their projects out in the open on other platforms like Reddit and Facebook. Just not here.