Remove the discovery hat (Archimedes / Eureka)
Three reasons:
1. Disadvantaging other users
Before @TheGuyWithTheTux posted the Community Wiki answer, the secret hats question was a free-for-all with five of the same answer all voted up to +40.
I found that every hour or so, someone would comment on one of my posts saying they've figured it out!, where they would guess an old theory.
I didn't have any problem linking old chat messages that disprove their theories, but it was exactly that.
They weren't in the chat.
We were creating a closed off environment that wasn't easy nor impossible to get to, where we internally shared progress.
Most of the people who were 'regulars' in that chatroom ended up with Archimedes hats.
Those people who weren't present weren't being disadvantaged necessarily, but at the same time, it wasn't exactly fair hunting ground.
2. Pops is not Big Brother
Doing a back-of-the-envelope calculation gives me over 1000 chat rooms (granted more than a few frozen or dead).
How is the Stack Exchange team (Pops) supposed to monitor 1000 chat rooms for scattered discussion and guesses?
And no, 64kb of Regex is not the correct answer to this rhetoric question.
3. There's no way to tell who has what and for what.
Some people got Archimedes in chat, and subsequently announced what the trigger was.
Other people got Archimedes, waited a while to see if people would additionally guess it, and release it later (Like I did with It's Over 9000)
Some people got it, and just never told us (until T-minus 10 minutes)
Additionally they had to be edited into the answer, which people were reluctant to do.
The answer was the closest people had to a central hat information port, without joining and lurking chat.
The people who received Archimedes weren't linked either, so people didn't know whether it was really close (like Cleanup Crew for most of WB), or already solved.
Counter-reasons:
1. Reasons to solve Secret Hat triggers declines:
- No way to effectively verify correct solutions (besides Pops saying yes)
- Less reason to solve them; hats go unsolved
2. One less hat