Once upon a time (2008 - ????) Ubuntu had a Hall of Fame page (then located at http://hall-of-fame.ubuntu.com) in which it would give credits to contributors such as developers who patched a bug in the One Hundred Papercuts project or the top weekly contributors right here on Ask Ubuntu. You can see Jono Bacon's blog post about it here.
Some time since the last contribution to its Launchpad repository in 2011 and now it was removed from the website completely (DNS record for hall-of-fame.ubuntu.com removed). Extensive Googling has yielded no answers in any form. The the last snapshot of the site by web.archive.org reveals no clues, either (it looks perfectly normal, and then there are no more snapshots).
So I'm curious- why was it removed?
Ubuntu Hall of Fame has been unmaintained since 2011 and was planned to be rewritten entirely. While the plan seems to have been approved, the blueprint on Launchpad had noted that implementation is making slow progress.
The plan and progress
According to this dated Wiki, the codebase of Ubuntu Hall of Fame is not maintainable and the plan was to make it open source.
Given that the Wiki was created in mid-2010, the project may have been left unmaintained much earlier than the last snapshot in 2011 on Internet Archive Wayback Machine.
In early 2011, the blueprint was registered in Ubuntu Launchpad. While some features have already been implemented, most of the work items are noted as "postponed".
Supporting facts
In mid-2011, one Ubuntu member has published a blog post on "UDS-O Budapest: Day 5", which mentioned the state of Ubuntu Hall of Fame.
Finally in late-2011, the designer of Ubuntu Hall of Fame has mentioned about the project on his blog in this post that is part of discussing the findings in the "Ubuntu Community Survey Report".
So what happened and why
The reason Ubuntu Hall of Fame was being removed, is largely due to lack of maintenance. However, the last quoted source may suggest that the project implementation may have been improperly done for recognizing contributors' works. More relevant sources as follows.
From this dated Wiki on UDS Jaunty report (partially quoted):
From the first post, a comment raised by one of the readers:
From the later post, another comment raised by one of the readers:
From this related post on Community Leadership Forum:
Based on above findings, we may understand why Ubuntu Hall of Fame was being removed and has been making slow progress for the past few years.
Disclaimer: This answer was written based on information that were found via Google Search, Internet Archive and few other sites. As such, the original post author was not in a position to give a conclusive answer.